Measuring and Constructing Angles Going Deeper
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1 Name Class 1-3 Date Measuring and Constructing ngles Going Deeper Essential question: What tools and methods can you use to copy an angle and bisect an angle? n angle is a figure formed by two rays with the same endpoint. The common endpoint is the vertex of the angle. The rays are the sides of the angle. ngles may be measured in degrees ( ). There are 360 in a circle, 1 of a circle. You write m for the so an angle that measures 1 is 360 measure of. ngles may be classified by their measures. cute ngle Right ngle Straight ngle 0 < m < 90 1 Obtuse ngle m = < m < 180 m = 180 G-CO.4.12 EXMPLE Copying an ngle Construct an angle with the same measure as S. In the space below, use a straightedge to draw a ray with endpoint X. X S Place the point of your compass on S and draw an arc that intersects both sides of the angle. Label the points of intersection T and U. C Without adjusting the compass, place the point of the compass on X and draw an arc that intersects the ray. Label the intersection Y. D Place the point of the compass on U and open it to the distance TU. T S U T E F Without adjusting the compass, place the point of the compass on Y and draw an arc. Label the intersection with the first arc Z. S U Use a straightedge to draw XZ. Chapter 1 15 Lesson 3
2 REFLECT 1a. How can you use a protractor to check your construction? 1b. If you draw X so that its sides appear to be longer than the sides shown for S, can the two angles have the same measure? Explain. n angle bisector is a ray that divides an angle into two angles that both have the same measure. In the figure, D bisects C, so m D = m DC. The arcs in the figure show equal angle measures. D 2 The following example shows how you can use a compass and straightedge to bisect an angle. G-CO.4.12 E X M P L E Constructing the isector of an ngle Construct the bisector of M. Work directly on the angle at right. C Place the point of your compass on point M. Draw an arc that intersects both sides of the angle. Label the points of intersection P and Q. Place the point of the compass on P and draw an arc in the interior of the angle. C Without adjusting the compass, place the point of the compass on Q and draw an arc that intersects the arc from Step. Label the intersection of the arcs R. D Use a straightedge to draw MR. REFLECT 2a. Explain how you could use paper folding to construct the bisector of an angle. M M P Q R Chapter 1 16 Lesson 3
3 p r a c t i c e Construct an angle with the same measure as the given angle Construct the bisector of the angle Explain how you can use a compass and straightedge to construct an angle that has twice the measure of. Then do the construction in the space provided. Chapter 1 17 Lesson 3
4 8. Explain how you can use a compass and straightedge to construct an angle that has 1 the measure of. Then do the construction in the space provided. 4 Chapter 1 18 Lesson 3
5 Name Class Date dditional Practice 1-3 For Exercises 1 and 2, use the figure shown. 1. Use a compass and straightedge to construct angle bisector DG. Given that m EDF = 90, find m EDG. m EDG = 2. Use your construction of EDG from Exercise 1. Construct XYZ with the same measure as EDG. 3. Use a straightedge to draw an acute angle. Use a compass and straightedge to copy the angle. Then bisect the copy of the angle. 4. Use a straightedge to draw an obtuse angle. Use a compass and straightedge to copy the angle. Then bisect the copy of the angle. Chapter 1 19 Lesson 3
6 Problem Solving For Exercises 1 2, use the figure shown. 1. Construct the bisector of in C. Construct the bisectors of and C. 2. What do you notice about the bisectors? C 3. Construct an angle whose measure is four times as great as m K, shown below. K Choose the best answer. 4. Mark drew PQR with measure 168. He constructed the angle bisector QX.Then he bisected PQX by constructing PY. What is m PQY? C 84 D Paula bisected XYZ, forming angles XYW and WYZ. Given that XYZ is an obtuse angle, which statement cannot be true? F m WYZ is less than 90. G m WYZ = m XYW H m WYZ is greater than 90. J m XYZ = 2 m XYW Chapter 1 20 Lesson 3
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