# SIXTH GRADE MATHEMATICS CHAPTER 10 AREA AND PERIMETER TOPICS COVERED:

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1 SIXTH GRADE MATHEMATICS CHAPTER 10 AREA AND PERIMETER TOPICS COVERED: Perimeter of Polygons Area of Parallelograms Area of Triangles Area of a Trapezoid Area of Irregular Figures

2 Activity 10-1: Sixth Grade Mathematics Formula Chart Perimeter Square P 4s Rectangle P l w Circumference Circle C r or C d Area Square Rectangle A s A lw or A bh Parallelogram A bh Triangle bh A or 1 A bh 1 ( b1 b) h Trapezoid A ( b1 b ) h or A= Circle A r Volume Cube Rectangular prism 3 V s V Bh or V lwh Pi 3 Customary Length 1 mile = 1760 yards 1 yard = 3 feet 1 foot = 1 inches Customary Volume/Capacity 1 pint = cups 1 cup = 8 fluid ounces 1 quart = pints 1 gallon = 4 quarts Customary Mass/Weight 1 ton =,000 pounds 1 pound = 16 ounces Metric Length 1 kilometer = 1000 meters 1 meter = 100 centimeters 1 centimeter = 10 millimeters Metric Volume/Capacity 1 liter = 1000 milliliters Metric Mass/Weight 1 kilogram = 1000 grams 1 gram = 1000 milligrams Time 1 year = 1 months 1 year = 5 weeks 1 week = 7 days 1 day = 4 hours 1 hour = 60 minutes 1 minute = 60 seconds

3 AREA OF TRIANGLES and QUADRILATERALS Area of a square Area of a rectangle Area of a parallelogram Area of a trapezoid Area of trapezoid Area of triangle

4 Activity 10-: Perimeter Perimeter: The distance around the outside of a figure. Per means around. Meter means measure. Thus, the perimeter of a figure is the measure around it. Classify each shape by giving the most specific name possible. Then find the perimeter of each figure cm 10 cm 14 ft 14 ft 4 m 3.5 m 5 m 18 cm 9 ft 8.5 m.0 km m 6..9 km 0.9 m.4 km 1.6 km 0.9 m 0.9 m 1.8 m Regular polygon.5 km 1.8 m 4 in Find the perimeter of each rectangle. 1.5 ft cm 5 ft 60 cm 8. m 15 m Find the perimeter of each rectangle. 10. L = 48 mm W = 3 mm 11. L = 6. km W = 4.7 km 1. L = 1 in. W = 1 in. 13. Find the perimeter of a sheet of typing paper 8.5 in. wide and 11 in. long. 14. How many feet of border are needed to go around a square bulletin board that is 4.5 ft. on each side? 15. Find the perimeter of your bedroom. 16. Find the perimeter of your house. 17. Find the perimeter of your backyard.

5 Activity 10-3: Area of Rectangles Use either the STAAR formula chart to help answer the following problems. Show all work on separate paper including three steps for each problem: write the correct formula, fill in the numbers for the variables, and then solve the equation. Game Shape Dimensions Perimeter Area 1. Racquetball Rectangle w = ft. l = 40 ft. A = 800 sq. ft.. NCAA basketball Rectangle w = 50 ft. l = 94 ft. 3. Ice hockey Rectangle w = 85 ft. l = ft. P = 570 ft. 4. Volleyball Rectangle w = ft. l = 60 ft. A = 1800 sq. ft. 5. Lacrosse Rectangle w = 180 ft. l = 330 ft. 6. NCAA soccer Rectangle w = 5 ft. l = 360 ft. 7. Football Rectangle w = 160 ft. 8. Tennis Rectangle 9. Baseball infield diamond l = 360 ft. w = 36 ft. l = 78 ft. Square s = ft. A = 8100 sq. ft. Bloom s Nursery designed a plan for Mrs. Johnsen s flower bed, as shown in the shaded part of the grid below. 10. Each square on the grid represents 5 square feet. What will be the approximate area of the flower bed? A. 100 ft. B. 80 ft. C. 0 ft. D. 16 ft. Mrs. Jones wants to paint a wall but not the door on the wall. 15 ft. 11. Door: 3 ft by 7 ft 10 ft. How many square feet of wall does Mrs. Jones need to paint?

6 Activity 10-4: Area of Parallelograms Formula for the area of a parallelogram: A bh Example: 4 m 8 m 5 m The height is measured straight up from the base. The height of this parallelogram is 4 m. A bh A 8 4 A 3 m. Find the perimeter and the area of each parallelogram. For the area, show all steps ft 10 ft 16 ft 15 m 16 m 1 m cm 3.6 cm 5.1 cm 6.5 cm 9.3 cm 7.5 cm ft 90 ft.0 m 1.8 m 100 ft 0.7 m The base of a parallelogram is 10 in. The height is in. more than half the base. Find the area. The height of a parallelogram is 4.5 cm. The base is twice the height. What is the area? The area of a parallelogram is 60 ft. The height is 5 ft. How long is the base? The area of a parallelogram is 75 cm. The base is 5 cm. Find the height.

7 Activity 10-5: Area of Triangles Formula for the area of a triangle: bh 1 A or bh (Half of the formula for a parallelogram.) Example: 5 in 6 in The height is measured straight up from the base. The height of this triangle is 5 in. bh A 6 5 A A 15 in. Find the area of each triangle using the formula above. Show all steps on a separate sheet of paper mm. 3 mm 7.5 cm 18 cm in. 7 m 1 in. 3 m in. 4 ft. 7 in. 4 ft km yd. 1 yd. 19 km 11. km. 3.7 km.

8 Activity 10-6: Area of Triangles Find the area of each triangle using the appropriate formula. Show all steps on a separate sheet of paper mm. 1 yd 8 mm 1 yd cm 18 in 0 cm 16 in 5. 8 ft in 17 ft. 7 in 9 cm cm.5 in 6 in m 15 m 4.5 km 1.4 km A triangular sail has a base of 5 m and a height of 10 m. If canvas costs \$18 a square meter, find the cost of canvas to make the sail. A square dinner napkin 8 in. on each side is folded along its diagonal. Find the area of the folder napkin.

9 Activity 10-7: Area of Trapezoids A trapezoid is a quadrilateral with only one pair of parallel sides. For determining its area one can start with the formula for a parallelogram: A bh. However with a trapezoid the top and bottom bases are different lengths. Thus, to find the area average the two bases and then multiply times the height. 1 1 Formula for the area of a trapezoid: A ( b1 b ) h [ ( 1 ) b b is just the average of the two bases.] 1 in 1 Example: A ( b1 b ) h 6 in A 1 (1 15)6 15 in 1 A (7) 6 The two bases are always parallel to each other. A 81 in. Find the area of each trapezoid using the formula above. Show all steps on a separate sheet of paper. Trapezoid A Trapezoid A Trapezoid B 1. x=14 cm, y=6.5 cm, z=1 cm. x=4 cm, y=10 cm, z=5 cm 3. x=40 m, y=50 m, z=0 m 4. x=7 ft, y=15 ft, z=7 ft Trapezoid B x z y 5. x=6 in, y=16 in, z=9 in 6. x=41 cm, y=78 cm, z= cm 7. x=.8 m, y=.5 m, z=1.5 m 8. z y 1 3 x= in, y=1 in, z=9 in 4 4 x 9. Cassie draws the following 4 figures. List the shapes in order of area from greatest to least. 10. What happens to the area of a trapezoid if both bases are tripled? cm 10 cm 6 cm 1.5 cm 10 cm What happens to the area of a trapezoid if both bases and the height are all divided by 3? 8 cm 10 cm 5 cm

10 Activity 10-8: Area of Irregular Figures Find the area of each figure m 4 m 4 m 6 m m m 6 m in 4 m 3 m m 6 in 8 in 10 in 1 in in 1 in 7 in 10 cm 9 cm 18 cm 5 cm Find the area of the shaded region in each figure. 7. yard with a sandbox 8. wall with windows 9. sidewalk around pool Yard 15 ft by 0 ft Sandbox 6 ft by 7 ft Wall 8 ft by 16 ft Each window 5 ft by 4 ft Sidewalk 30 ft by 30 ft Pool 7 ft by 7 ft 10. A bedroom is 15 ft long and 1 ft wide. How much will it cost to carpet the room if carpeting costs \$ per square yard? (1 yd = 3 ft) 11. A rose garden in the city park is rectangular and is 9 m wide. If the area of the rectangle is 144 m, what is the length of the garden?

11 Activity 10-9: Area and Perimeter Use graph paper for all drawings and all work. 1. Draw a figure whose perimeter is 4 units.. Draw a different figure whose perimeter is also 4 units. 3. Draw a figure whose area is 4 square units. 4. Draw a different figure whose area is also 4 square units. 5. Make up a real world word problem in which you need to find the perimeter of any quadrilateral. 6. Make up a real world word problem in which you need to find the area of any quadrilateral. 7. Can two different figures have the same area but different perimeters? Explain your answer. 8. Your dog, Benji, needs a new play area. You are in charge of building a fence around the dog s play area so that he can t run away. You are given 80 feet of fencing to build your play area. Build two different play areas that you think would be suitable for a dog using all of the fencing. For each of your SCALE drawings: Calculate the perimeter Calculate the area Explain why/how you chose the shape for each play area PART in. The perimeter of the rectangle is 6 in. Find the length of each side. 10. Amanda bought 40 meters of fencing to make an enclosure for her dog, Sushi. If Amanda expects a rectangular enclosure, what is the largest area it can have? Explain your answer. 11. The width of a rectangle is 4.5 inches and its perimeter is 31 inches. What is the length of the rectangle? PART 3 1. The club house is a rectangle that is 5 feet by 40 feet in size. The officers voted to put a 6-foot sidewalk all around the building, leaving a -foot space for plants between the building and the sidewalk. Give the perimeter of the outer edge of the sidewalk and the area of the sidewalk itself. 13. What is the area of each black and white piece if the whole square measures 0 cm on each side? What percent of the area of the large square is the small shaded square?

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