Student s Copy. Geometry Unit 2. Similarity, Proof, and Trigonometry. Eureka Math. Eureka Math
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1 Student s Copy Geometry Unit 2 Similarity, Proof, and Trigonometry Eureka Math Eureka Math
2 Lesson 1 Lesson 1: Scale Drawings Triangle AAAAAA is provided below, and one side of scale drawing AA BB CC is also provided. Use construction tools to complete the scale drawing and determine the scale factor. What properties do the scale drawing and the original figure share? Explain how you know. Lesson 1: Scale Drawings 1
3 Lesson 2 Lesson 2: Making Scale Drawings Using the Ratio Method One of the following images shows a well-scaled drawing of AABBCC done by the Ratio Method, the other image is not a well-scaled drawing. Use your ruler and protractor to measure and calculate to justify which is a scale drawing, and which is not. Figure 1 Figure 2 Lesson 2: Making Scale Drawings Using the Ratio Method 2
4 Lesson 3 Lesson 3: Making Scale Drawings Using the Parallel Method With a ruler and setsquare, use the Parallel Method to create a scale drawing of quadrilateral AABBCCAA about center OO and scale factor rr = 3. Verify that the resulting figure is in fact a scale drawing by showing that corresponding side lengths 4 are in constant proportion and the corresponding angles are equal in measurement. What kind of error in the Parallel Method might prevent us from having parallel, corresponding sides? Lesson 3: Making Scale Drawings Using the Parallel Method 3
5 Lesson 4 Lesson 4: Comparing the Ratio Method with the Parallel Method In the diagram, XXXX. AAAA Use the diagram to answer the following: 1. If BBBB = 4, BBBB = 5, and BBBB = 6, what is BBBB? Not drawn to Scale 2. If BBBB = 9, BBBB = 15, and BBBB = 15, what is YYYY? Lesson 4: Comparing the Ratio Method with the Parallel Method 4
6 Lesson 5 Lesson 5: Scale Factors 1. Two different points RR and YY are dilated from SS with a scale factor of 3, and RRRR = 15. Use the Dilation Theorem to 4 describe two facts that are known about RR YY. 2. Which diagram(s) below represents the information given in Question 1? Explain your answer(s). a. b. Lesson 5: Scale Factors 5
7 Lesson 6 Lesson 6: Dilations as Transformations of the Plane 1. Which transformations of the plane are distance-preserving transformations? Provide an example of what this property means. 2. Which transformations of the plane preserve angle measure? Provide one example of what this property means. 3. Which transformation is not considered a rigid motion and why? Lesson 6: Dilations as Transformations of the Plane 6
8 Lesson 7 Lesson 7: How Do Dilations Map Segments? 1. Given the dilation DD 3 OO,, a line segment PPPP, and that OO is not on, PPPP what can we conclude about the image of? PPPP 2 2. Given figures A and B below, AAAA, DDDD UUUU XXXX and UUUU XXXX. Determine which figure has a dilation mapping the parallel line segments and locate the center of dilation OO. For the figure in which the dilation does not exist, explain why. Figure A Figure B Lesson 7: How Do Dilations Map Segments? 7
9 Lesson 8 Lesson 8: How Do Dilations Map Rays, Lines, and Circles Given points OO, SS, and TT below, complete parts (a) (e): a. Draw rays SSSS and. TTTT What is the union of these rays? b. Dilate SSSS from OO using scale factor rr = 2. Describe the image of SSSS. c. Dilate TTTT from OO using scale factor rr = 2. Describe the image of. TTTT d. What does the dilation of the rays in parts (b) and (c) yield? e. Dilate circle CC with radius TTTT from OO using scale factor rr = 2. Lesson 8: How Do Dilations Map Rays, Lines, and Circles 8
10 Lesson 9 Lesson 9: How Do Dilations Map Angles? 1. Dilate parallelogram SSSSSSSS from center OO using a scale factor of rr = How does mm TT compare to mm TT? 3. Using your diagram, prove your claim from Problem 2. Lesson 9: How Do Dilations Map Angles? 9
11 Lesson 10 Lesson 10: Dividing the King s Foot into 12 Equal Pieces 1. Use the Side Splitter Method to divide MMMM into 7 equal-sized pieces. 2. Use the Dilation Method to divide PPPP into 9 equal-sized pieces. 3. If the segment below represents the interval from zero to one on the number line, locate and label Lesson 10: Dividing the King s Foot into 12 Equal Pieces 10
12 Lesson 11 Lesson 11: Dilations from Different Centers Marcos constructed the composition of dilations shown below. Drawing 2 is 3 the size of Drawing 1, and Drawing 3 is 8 twice the size of Drawing Determine the scale factor from Drawing 1 to Drawing Find the center of dilation mapping Drawing 1 to Drawing 3. Lesson 11: Dilations from Different Centers 11
13 Lesson 12 Lesson 12: What Are Similarity Transformations, and Why Do We Need Them? 1. Figure A' is similar to figure A. Which transformations compose the similarity transformation that maps Figure A onto Figure A'? Figure A Figure A' 2. Is there a sequence of dilations and basic rigid motions that takes the small figure to the large figure? Take measurements as needed. Lesson 12: What Are Similarity Transformations, and Why Do We Need Them? 12
14 Lesson 13 Lesson 13: Properties of Similarity Transformations A similarity transformation consists of a translation along the vector, FFFF followed by a dilation from point PP with a scale factor rr = 2, and finally a reflection over line mm. Use construction tools to find AA CC DD EE. Lesson 13: Properties of Similarity Transformations 13
15 Lesson 13 Example 1 l Example 2 mm Lesson 13: Properties of Similarity Transformations 14
16 Lesson 14 Lesson 14: Similarity 1. In the diagram, AABBCC~ DDDDDD by the dilation with center OO and scale factor rr. Explain why DDDDDD~ AABBCC. 2. Radii CCCC and TTTT are parallel. Is circle CC CC,CCCC similar to circle CC TT,TTTT? Explain. 3. Two triangles, AABBCC and DDDDDD, are in the plane so that AA = DD, BB = EE, CC = FF, and DDDD AAAA = EEEE BBBB = DDDD AAAA. Summarize the argument that proves that the triangles must be similar. Lesson 14: Similarity 15
17 Lesson 15 Lesson 15: The Angle-Angle (AA) Criterion for Two Triangles to be Similar 1. Given the diagram to the right, UUUU, VVVV and WWWW. UUUU Show that UUUUUU~ WWWWWW. 2. Given the diagram to the right and DDDD, KKKK find FFFF and DDKK. Lesson 15: The Angle-Angle (AA) Criterion for Two Triangles to be Similar 16
18 Lesson 15 Cutouts to use for in-class discussion: Lesson 15: The Angle-Angle (AA) Criterion for Two Triangles to be Similar 17
19 Lesson 16 Lesson 16: Between-Figure and Within-Figure Ratios Dennis needs to fix a leaky roof on his house but does not own a ladder. He thinks that a 25 foot ladder will be long enough to reach the roof, but he needs to be sure before he spends the money to buy one. He chooses a point PP on the ground where he can visually align the roof of his car with the edge of the house roof. Help Dennis determine if a 25 foot ladder will be long enough for him to safely reach his roof. Lesson 16: Between-Figure and Within-Figure Ratios 18
20 Lesson 17 Lesson 17: The Side-Angle-Side (SAS) and Side-Side-Side (SSS) Criteria for Two Triangles to be Similar 1. Given AABBBB and LLLLLL in the diagram below, and BB LL, determine if the triangles are similar. If so, write a similarity statement and state the criterion used to support your claim. 2. Given DDDDDD and DDDDEE in the diagram below, determine if the triangles are similar. If so, write a similarity statement, and state the criterion used to support your claim. Lesson 17: The Side-Angle-Side (SAS) and Side-Side-Side (SSS) Criteria for Two Triangles to be Similar 19
21 Lesson 18 Lesson 18: Similarity and the Angle Bisector Theorem 1. The sides of a triangle have lengths of 12, 16, and 21. An angle bisector meets the side of length 21. Find the lengths xx and yy. 2. The perimeter of UUUUUU is WWWW bisects UUUUUU, UUUU = 2, and VVVV = 2 1. Find UUUU and VVVV. 2 2 Lesson 18: Similarity and the Angle Bisector Theorem 20
22 Lesson 19 Lesson 19: Families of Parallel Lines and the Circumference of the Earth 1. Given the diagram to the right, AAAA BBBB, CCCC AAAA = 6.5 cm, AABB = 7.5 cm, and HHHH = 18 cm, find OOCC. Lesson 19: Families of Parallel Lines and the Circumference of the Earth 21
23 Lesson Martin the Martian lives on planet Mart. Martin wants to know the circumference of planet Mart, but it is too large to measure directly. He uses the same method as Eratosthenes by measuring the angle of the sun s rays in two locations. The sun shines on a flag pole in Martinsburg, but there is no shadow. At the same time the sun shines on a flag pole in Martville and a shadow forms a 10 angle with the pole. The distance from Martville to Martinsburg is 294 miles. What is the circumference of Planet Mart? Lesson 19: Families of Parallel Lines and the Circumference of the Earth 22
24 Lesson 20 Lesson 20: How Far Away Is the Moon? 1. On Planet A, a 1 inch diameter ball must be held at a height of 72 inches to just block the sun. If a moon orbiting 4 Planet A just blocks the sun during an eclipse, approximately how many moon diameters is the moon from the planet? 2. Planet A has a circumference of 93,480 miles. Its moon has a diameter that is approximated to be 1 that of Planet 8 A. Find the approximate distance of the moon from Planet A. Lesson 20: How Far Away Is the Moon? 23
25 Mid-Module Assessment Task The coordinates of triangle AAAAAA are shown on the coordinate plane below. The triangle is dilated from the origin by scale factor rr = 2. a. Identify the coordinates of the dilated AA BB CC. b. Is AA BB CC ~ AABBCC? Explain. Module 2: Similarity, Proof, and Trigonometry 24
26 Mid-Module Assessment Task Points AA, BB, and CC are not collinear, forming angle BBBBBB. Point PP is on ray AAAA, and PP is farther from AA than BB. Line l passes through PP and is parallel to segment BBBB. It meets ray AAAA at point QQ. a. Draw a diagram to represent the situation described. b. Is PPPP longer or shorter than BBBB? c. Prove that AAAAAA ~ AAPPQQ. d. What other pairs of segments in this figure have the same ratio of lengths that PPPP has to? BBBB Module 2: Similarity, Proof, and Trigonometry 25
27 Mid-Module Assessment Task There is a triangular floor space AAAAAA in a restaurant. Currently, a square portion DDDDDDDD is covered with tile. The owner wants to remove the existing tile, and then tile the largest square possible within AAAAAA, keeping one edge of the square on AAAA. a. Describe a construction that uses a dilation with center AA that can be used to determine the maximum square DD EE GG FF within AAAAAA with one edge on. AAAA b. What is the scale factor of GGGG to GG FF in terms of the distances AAAA and AAAA? c. The owner uses the construction in part (a) to mark off where the square would be located. He measures AAAA to be 15 feet and EEEE to be 5 feet. If the original square is 144 square feet, how many square feet of tile does he need for DD EE GG FF? Module 2: Similarity, Proof, and Trigonometry 26
28 Mid-Module Assessment Task AAAAAAAA is a parallelogram, with the vertices listed counterclockwise around the figure. Points MM, NN, OO, and PP are the midpoints of sides AAAA, BBBB, CCCC, and DDDD, respectively. The segments MMMM and NNNN cut the parallelogram into four smaller parallelograms, with the point WW in the center of AAAAAAAA as a common vertex. a. Exhibit a sequence of similarity transformations that takes AAAAAA to CCCCCC. Be specific in describing the parameter of each transformation; e.g., if describing a reflection, state the line of reflection. b. Given the correspondence in AAAAAA similar to CCCCCC, list all corresponding pairs of angles and corresponding pairs of sides. What is the ratio of the corresponding pairs of angles? What is the ratio of the corresponding pairs of sides? Module 2: Similarity, Proof, and Trigonometry 27
29 Mid-Module Assessment Task Given two triangles, AAAAAA and DDDDDD, mm CCCCCC = mm FFFFFF, and mm CCCCCC = mm FFFFFF. Points AA, BB, DD, and EE lie on line ll as shown. Describe a sequence of rigid motions and/or dilations to show that AAAAAA ~ DDDDDD, and sketch an image of the triangles after each transformation. Module 2: Similarity, Proof, and Trigonometry 28
30 Mid-Module Assessment Task JJJJJJ is a right triangle, NNNN, KKKK NNNN, JJJJ MMMM OOOO. a. List all sets of similar triangles. Explain how you know. b. Select any two similar triangles, and show why they are similar. Module 2: Similarity, Proof, and Trigonometry 29
31 Mid-Module Assessment Task a. The line PPPP contains point OO. What happens to PPPP with a dilation about OO and scale factor of rr = 2? Explain your answer. b. The line PPPP does not contain point OO. What happens to PPPP with a dilation about OO and scale factor of rr = 2? Module 2: Similarity, Proof, and Trigonometry 30
32 Mid-Module Assessment Task Use the diagram below to answer the following questions. a. State the pair of similar triangles. Which similarity criterion guarantees their similarity? b. Calculate DDDD to the hundredths place. Module 2: Similarity, Proof, and Trigonometry 31
33 Mid-Module Assessment Task In triangle AAAAAA, m AA is 40, m BB is 60, and m CC is 80. The triangle is dilated by a factor of 2 about point PP to form triangle AA BB CC. It is also dilated by a factor of 3 about point QQ to form AA BB CC. What is the measure of the angle formed by line AA BB and line BB CC? Explain how you know. Module 2: Similarity, Proof, and Trigonometry 32
34 Mid-Module Assessment Task In the diagram below, AAAA = CCCC = EEGG, and angles BBBBBB, DDDDDD, and FFFFFF are right. The two lines meet at a point to the right. Are the triangles similar? Why or why not? Module 2: Similarity, Proof, and Trigonometry 33
35 Mid-Module Assessment Task The side lengths of the following right triangle are 16, 30, and 34. An altitude of a right triangle from the right angle splits the hypotenuse into line segments of length xx and yy. a. What is the relationship between the large triangle and the two sub-triangles? Why? b. Solve for h, xx, and yy. c. Extension: Find an expression that gives h in terms of xx and yy. Module 2: Similarity, Proof, and Trigonometry 34
36 Lesson 21 Lesson 21: Special Relationships Within Right Triangles Dividing into Two Similar Sub-Triangles Given RRRRRR, with altitude SSSS drawn to its hypotenuse, answer the questions below. 1. Complete the similarity statement relating the three triangles in the diagram. RRRRRR~ ~ 2. Complete the table of ratios specified below. shorter leg: hypotenuse longer leg: hypotenuse shorter leg: longer leg RRRRRR RRRRRR SSSSSS 3. Use the values of the ratios you calculated to find the length of SSSS. Lesson 21: Special Relationships Within Right Triangles Dividing into Two Similar Sub-Triangles 35
37 Lesson 22 Lesson 22: Multiplying and Dividing Expressions with Radicals Write each expression in its simplest radical form = = 3. Teja missed class today. Explain to her how to write the length of the hypotenuse in simplest radical form. Lesson 22: Multiplying and Dividing Expressions with Radicals 36
38 Lesson 22 Perfect Squares of Numbers = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = 900 Lesson 22: Multiplying and Dividing Expressions with Radicals 37
39 Lesson 23 Lesson 23: Adding and Subtracting Expressions with Radicals 1. Simplify Simplify Write a radical addition or subtraction problem that cannot be simplified, and explain why it cannot be simplified. Lesson 23: Adding and Subtracting Expressions with Radicals 38
40 Lesson 24 Lesson 24: Prove the Pythagorean Theorem Using Similarity A right triangle has a leg with a length of 18 and a hypotenuse with a length of 36. Bernie notices that the hypotenuse is twice the length of the given leg, which means it is a triangle. If Bernie is right, what should the length of the remaining leg be? Explain your answer. Confirm your answer using the Pythagorean Theorem. Lesson 24: Prove the Pythagorean Theorem Using Similarity 39
41 Lesson 25 Lesson 25: Incredibly Useful Ratios 1. Use the chart from the Exploratory Challenge to approximate the unknown lengths yy and zz to one decimal place. 2. Why can we use the chart from the Exploratory Challenge to approximate the unknown lengths? Lesson 25: Incredibly Useful Ratios 40
42 Lesson 25 Group 1 Lesson 25: Incredibly Useful Ratios 41
43 Lesson 25 Group 2 Lesson 25: Incredibly Useful Ratios 42
44 Lesson 25 Identifying Sides of a Right Triangle with Respect to a Given Right Angle Poster - With respect to AA, the opposite side, oooooo, is side BBBB. - With respect to AA, the adjacent side, aaaaaa, is side. BBBB - The hypotenuse, hyyyy, is side AAAA and is always opposite from the 90 angle. - With respect to CC, the opposite side, oooooo, is side. AAAA - With respect to CC, the adjacent side, aaaaaa, is side BBBB. - The hypotenuse, hyyyy, is side AAAA and is always opposite from the 90 angle. Lesson 25: Incredibly Useful Ratios 43
45 Lesson 26 Lesson 26: The Definition of Sine, Cosine, and Tangent 1. Given the diagram of the triangle, complete the following table. Angle Measure ssiiii θθ ccoooo θθ ttaaaa θθ ss tt a. Which values are equal? b. How are tan αα and tan ββ related? 2. If uu and vv are the measures of complementary angles such that sin uu = 2 5 of the right triangle in the diagram below with possible side lengths. 21 and tan vv =, label the sides and angles 2 Lesson 26: The Definition of Since, Cosine, and Tangent 44
46 Lesson 27 Lesson 27: Sine and Cosine of Complementary Angles and Special Angles 1. Find the values for θθ that make each statement true. a. sin θθ = cos 32 b. cos θθ = sin(θθ + 20) 2. LLLLLL is a right triangle. Find the unknown lengths xx and yy. Lesson 27: Sine and Cosine of Complementary Angles and Special Angles 45
47 Lesson 28 Lesson 28: Solving Problems Using Sine and Cosine 1. Given right triangle AAAAAA with hypotenuse AAAA = 8.5 and AA = 55, find AAAA and AAAA to the nearest hundredth. 2. Given triangle DDDDDD, DD = 22, FF = 91, DDDD = 16.55, and DDDD = 6.74, find DDDD to the nearest hundredth. Lesson 28: Solving Problems Using Sine and Cosine 46
48 Lesson 29 Lesson 29: Applying Tangents 1. The line on the coordinate plane makes an angle of depression of 24. Find the slope of the line, correct to four decimal places. 2. Samuel is at the top of a tower and will ride a trolley down a zip-line to a lower tower. The total vertical drop of the zip-line is 40 ft. The zip line s angle of elevation from the lower tower is What is the horizontal distance between the towers? Lesson 29: Applying Tangents 47
49 Lesson 30 Lesson 30: Trigonometry and the Pythagorean Theorem 1. If sin ββ = 4 29, use trigonometric identities to find sin ββ and tan ββ Find the missing side lengths of the following triangle using sine, cosine, and/or tangent. Round your answer to four decimal places. Lesson 30: Trigonometry and the Pythagorean Theorem 48
50 Lesson 31 Lesson 31: Using Trigonometry to Determine Area 1. Given two sides of the triangle shown, having lengths of 3 and 7, and their included angle of 49, find the area of the triangle to the nearest tenth. 2. In isosceles triangle PPPPPP, the base QQQQ = 11, and the base angles have measures of Find the area of PPPPPP. Lesson 31: Using Trigonometry to Determine Area 49
51 Lesson 32 Lesson 32: Using Trigonometry to Find Side Lengths of an Acute Triangle 1. Use the Law of Sines to find lengths bb and cc in the triangle below. Round answers to the nearest tenth as necessary. ` 2. Given DDDDDD, use the Law of Cosines to find the length of the side marked dd to the nearest tenth. Lesson 32: Using Trigonometry to Find Side Lengths of an Acute Triangle 50
52 Lesson 33 Lesson 33: Applying the Laws of Sines and Cosines 1. Given triangle MLK, KL = 8, KM = 7, and K = 75, find the length of the unknown side to the nearest tenth. Justify your method. 2. Given triangle ABC, A = 36, B = 79, and AC = 9, find the lengths of the unknown sides to the nearest tenth. Lesson 33: Applying the Laws of Sines and Cosines 51
53 End-of-Module Assessment Task 1. In the figure below, rotate EEEEEE about EE by 180 to get EEAA BB. If AA BB CCCC, prove that EEEEEE ~ EECCCC. Module 2: Similarity, Proof, and Trigonometry 52
54 End-of-Module Assessment Task 2. Answer the following questions based on the diagram below. a. Find the sine and cosine values of angles rr and ss. Leave answers as fractions. sin rr = sin ss = cos rr = cos ss = tan rr = tan ss = b. Why is the sine of an acute angle the same value as the cosine of its complement? Module 2: Similarity, Proof, and Trigonometry 53
55 End-of-Module Assessment Task 3. A radio tower is anchored by long cables called guy wires, such as AAAA in the figure below. Point AA is 250 m from the base of the tower, and BBBBBB = 59. a. How long is the guy wire? Round to the nearest tenth. b. How far above the ground is it fastened to the tower? c. How tall is the tower, CCCC, if DDDDDD = 71? Module 2: Similarity, Proof, and Trigonometry 54
56 End-of-Module Assessment Task 4. The following problem is modeled after a surveying question developed by a Chinese mathematician during the Tang Dynasty in the seventh century A.D. A building sits on the edge of a river. A man views the building from the opposite side of the river. He measures the angle of elevation with a hand-held tool and finds the angle measure to be 45. He moves 50 feet away from the river and re-measures the angle of elevation to be 30. What is the height of the building? From his original location, how far away is the viewer from the top of the building? Round to the nearest whole foot. Module 2: Similarity, Proof, and Trigonometry 55
57 End-of-Module Assessment Task 5. Prove the Pythagorean Theorem using similar triangles. Provide a well-labeled diagram to support your justification. Module 2: Similarity, Proof, and Trigonometry 56
58 End-of-Module Assessment Task 6. In right triangle AAAAAA with BB a right angle, a line segment BB CC connects side AAAA with the hypotenuse so that AAAA CC is a right angle as shown. Use facts about similar triangles to show why cos CC = cos CC. Module 2: Similarity, Proof, and Trigonometry 57
59 End-of-Module Assessment Task 7. Terry said, I will define the zine of an angle xx as follows. Build an isosceles triangle in which the sides of equal length meet at angle xx. The zine of xx will be the ratio of the length of the base of that triangle to the length of one of the equal sides. Molly said, Won t the zine of xx depend on how you build the isosceles triangle? a. What can Terry say to convince Molly that she need not worry about this? Explain your answer. b. Describe a relationship between zine and sin. Module 2: Similarity, Proof, and Trigonometry 58
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