Perimeters of Composite Figures
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1 8. Perimeters of Composite Figures How can you find the perimeter of a composite figure? ACTIVITY: Finding a Pattern Work with a partner. Describe the pattern of the perimeters. Use your pattern to find the perimeter of the tenth figure in the sequence. (Each small square has a perimeter of 4.) a. b. c. ACTIVITY: Combining Figures Work with a partner. a. A rancher is constructing a rectangular corral and a trapezoidal corral, as shown. How much fencing does the rancher need to construct both corrals? 74 yd 50 yd 70 yd 74 yd 70 yd Geometry In this lesson, you will find perimeters of composite figures. 74 yd b. Another rancher is constructing one corral by combining the two corrals above, as shown. Does this rancher need more or less fencing? Explain your reasoning. c. How can the rancher in part (b) combine the two corrals to use even less fencing? 34 Chapter 8 ms_red pe_080.indd 34 Circles and Area //5 8:53: AM
2 3 ACTIVITY: Submitting a Bid Work with a partner. You want to bid on a tiling contract. You will be supplying and installing the brown tile that borders the swimming pool. In the figure, each grid square represents square foot. Your cost for the tile is $4 per linear foot. It takes about 5 minutes to prepare, install, and clean each foot of tile. a. How many brown tiles do you need for the border? b. Write a bid for how much you will charge to supply and install the tile. Include what you want to charge as an hourly wage. Estimate what you think your profit will be. Math Practice Communicate Precisely What do you need to include to create an accurate bid? Explain. 4. IN YOUR OWN WORDS How can you find the perimeter of a composite figure? Use a semicircle, a triangle, and a parallelogram to draw a composite figure. Label the dimensions. Find the perimeter of the figure. Use what you learned about perimeters of composite figures to complete Exercises 3 5 on page 38. Section 8. ms_red pe_080.indd 35 Perimeters of Composite Figures 35 //5 8:53:9 AM
3 8. Lesson Lesson Tutorials Key Vocabulary composite figure, p. 36 A composite figure is made up of triangles, squares, rectangles, semicircles, and other two-dimensional figures. Here are two examples. triangle semicircle square rectangle To find the perimeter of a composite figure, find the distance around the figure. EXAMPLE Estimating a Perimeter Using Grid Paper Estimate the perimeter of the arrow. Count the number of grid square lengths around the arrow. There are 0. Count the number of diagonal lengths around the arrow. There are 8. Estimate the diagonal length to be.5 units. Length of 0 grid square lengths: 0 = 0 units Length of 8 diagonal lengths: 8.5 = units So, the perimeter is about 0 + = 3 units. Exercises 3 8 Estimate the perimeter of the figure Chapter 8 Circles and Area
4 EXAMPLE Finding a Perimeter The figure is made up of a semicircle and a triangle. Find the perimeter. The distance around the triangular part of the figure is = 4 feet. The distance around the semicircle is one-half the circumference of a circle with a diameter of 0 feet. 8 ft 6 ft 0 ft C = π d Divide the circumference by Substitute 3.4 for π and 0 for d. = 5.7 Simplify. So, the perimeter is about = 9.7 feet. EXAMPLE 3 Finding a Perimeter The running track is made up of a rectangle and two semicircles. Find the perimeter. The semicircular ends of the track form a circle with a radius of 3 meters. Find its circumference. 3 m 00 m C = π r Write formula for circumference Substitute 3.4 for π and 3 for r. = Multiply. So, the perimeter is about = meters. 3. The figure is made up of a 4. The figure is made up of a semicircle and a triangle. square and two semicircles. Find the perimeter. Find the perimeter. 8 m Exercises 9 6 cm 0 cm 4 cm Section 8. Perimeters of Composite Figures 37
5 8. Exercises Help with Homework. REASONING Is the perimeter of the composite figure equal to the sum of the perimeters of the individual figures? Explain.. OPEN-ENDED Draw a composite figure formed by a parallelogram and a trapezoid. 9+(-6)=3 3+(-3)= 4+(-9)= 9+(-)= Estimate the perimeter of the figure Find the perimeter of the figure m cm 5 m m 8 in. 8 in. 4 cm 7 m 3 in. 3 in. 9.5 cm 4 cm 6.5 cm. ERROR ANALYSIS Describe and correct the error in finding the perimeter of the figure. 4 in. 4 in. Perimeter = = 3 in. 4 in. 38 Chapter 8 Circles and Area
6 Find the perimeter of the figure in. 4. in in. 9 in. ft 40 ft 85 ft 6. PASTURE A farmer wants to fence a section of land for a horse pasture. Fencing costs $7 per yard. How much will it cost to fence the pasture? 450 ft 450 ft 450 ft 40% of a circle of radius 5 ft 7. BASEBALL You run around the perimeter of the baseball field at a rate of 9 feet per second. How long does it take you to run around the baseball field? 5 ft 300 ft 8. TRACK In Example 3, the running track has six lanes. Explain why the starting points for the six runners are staggered. Draw a diagram as part of your explanation. 9. How can you add a figure to a composite figure without increasing its perimeter? Draw a diagram to support your answer. Evaluate the expression. (Skills Review Handbook) 0..5(3). 4.37(8). 3.4(7) 3. 8.(5) 4. MULTIPLE CHOICE Which expression is equivalent to (5y + 4) (7 y)? (Section 3.) A y 0 B 9y + 8 C 3y 0 D 9y 0 Section 8. Perimeters of Composite Figures 39
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