Area. Domain 4 Lesson 25. Getting the Idea
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1 Domain 4 Lesson 5 Area Common Core Standard: 7.G.6 Getting the Idea The area of a figure is the number of square units inside the figure. Below are some formulas that can be used to find the areas of common polygons. Formula Triangle A 5 1 bh, where b represents the base length and h represents the height. Parallelogram A 5 bh, where b represents the base length and h represents the height. Rectangle A 5 lw, where l represents the length and w represents the width. Square A 5 s, where s represents the length of a side. Diagram h b h b l s w Trapezoid A 5 1 ( b 1 1 b )h, where b 1 and b represent the base lengths and h represents the height. b 1 b h 5
2 Example 1 What is the area of this trapezoid? 6 in. Strategy Step 1 Step Solution Use the formula for the area of a trapezoid. Write the formula for the area of a trapezoid. A 5 1 ( b 1 b )h 1 Substitute the known values in the formula and simplify. Let b in. and let b 5 6 in. A 5 1 (10 in. 1 6 in.) 3 8 in. 5 1 (16 in.) 3 8 in. 5 8 in. 3 8 in in. The area of the trapezoid is 64 in. 8 in. 10 in. Example Phillip drew the figure on the right to represent the design of his new garage. What is the area of the figure? 5 cm Strategy Divide the figure into smaller, familiar figures. Find the area of each figure. Then add to find the total area. 9 cm Step 1 Divide the figure into familiar figures. The figure is divided into a triangle and a rectangle. 10 cm Step Step 3 Find the area of the triangle. The height, h, of the triangle is. To determine the base length, subtract the two known horizontal lengths: 10 cm 5 4. So, the base, b, of the triangle is. A of triangle 5 1 bh cm Find the area of the rectangle. The length, l, is 10 cm, and the width, w, is 9 cm. A of rectangle 5 lw cm 10 cm 5 cm 9 cm 6 Domain 4: Geometry
3 Lesson 5: Area Step 4 Solution Add those areas to find the total area of the figure. A of composite figure cm The area of the figure is 96 square centimeters. Sometimes you will not need an exact answer. Use rounding to find an estimate. Example 3 What is the approximate area of the figure? 1.5 in. 1.5 in..75 in. 1.5 in. Strategy Step 1 Divide the figure into shapes whose area formulas you know. Divide the figure into 1 rectangle and triangles. 1.5 in. 1.5 in. 1.5 in. 1.5 in..75 in. Step Step 3 Step 4 Solution Find the approximate area of the rectangle. A 5 lw A < Round each decimal to the nearest whole number. < 3 in. Find the approximate area of the triangles. A 5 1 bh A < Round each decimal to the nearest whole number. < 1 in. There are triangles: 3 1 in. 5 in. Add to find the approximate total area of the figure. 3 in. 1 in. 5 5 in. The approximate area of the figure is 5 square inches. 7
4 Coached Example Aster made a sticker in the shape shown below. 1. cm 1.5 cm What is the area of the sticker? A parallelogram and a are combined to form the sticker. What is the formula for the area of a parallelogram? Find the area of the parallelogram. What is the formula for the area of a rectangle? Find the area of the rectangle. Add to find the total area of the figure. The area of the sticker is. 8 Domain 4: Geometry
5 Lesson 5: Area Lesson Practice Choose the correct answer. 1. A rectangular playground is 85 feet long and 60 feet wide. What is the area of the playground? A. 90 ft C.,550 ft B. 510 ft D. 5,100 ft. A banner is shaped like the triangle shown below. 9 cm 5 cm What is the area of the banner? A. 14 cm C. 8 cm B..5 cm D. 45 cm 3. A window is shaped like the trapezoid shown below. 7 in. 9 in. 4.5 in. What is the area of the window? A in. C in. B. 63 in. D in. 4. Which of the figures below have the same area? 4 m 8 m 7 m 6 m Figure 1 Figure 6 m 5 m 1 m 9 m Figure 3 Figure 4 A. figures 1 and B. figures and 3 C. figures and 4 D. figures 3 and 4 4 m 5. What is the area of a parallelogram with a base length of 1 yd and a height of 9 yd? A. 60 square yards B. 90 square yards C. 108 square yards D. 10 square yards 6. Which figure has the least area? A. square with a side length of 9 cm B. parallelogram with a base of 1 cm and a height of C. triangle with a base of 18 cm and a height of D. rectangle with a width of 7 cm and a length of 8 cm 9
6 7. Carl cut two triangular boards from the corners of a rectangular board as shown by the shaded sections below. 8. What is the area of the figure below? 1 cm 5 cm 40 cm 10.5 cm What is the combined area of the shaded sections? 1 cm A cm B. 6.5 cm C. 7.5 cm D. 5.5 cm A. 960 cm B. 768 cm C. 64 cm D. 480 cm 9. Ross uses nylon string as a border around a square picture. The string is 60 inches long. A. What is the area of the picture in square inches? Show your work. B. Ross doubles the length of each side of the picture. What is the area of the new square picture in square inches? Show your work. 30 Domain 4: Geometry
7 Lesson 5: Area 10. Which figure has an area of 144 square inches? Circle all that apply. A. triangle with base 1 inches and height 4 inches B. parallelogram with base 4 inches and height 6 inches C. rectangle with length 18 inches and width 9 inches D. square with side 1 inches E. trapezoid with bases 8 inches and 10 inches and height 8 inches 11. Use numbers from the box to make each statement true. 4.1 cm 4.1 cm 4.1 cm 3.7 cm The approximate area of the square is square centimeters. The approximate area of the trapezoid is square centimeters. 16. cm The approximate area of the composite figure is square centimeters
8 1. Find the area of each polygon. Write each polygon in the correct box. Triangle b 10 m h 6 m Parallelogram b 14 m h 10 m Rectangle l m w 9 m Square s 8 m Trapezoid b 1 6 m b 1 m h 10 m Area is a Multiple of 4. Area is a Multiple of Draw a line from each figure to its area. A. B. C. D. cm cm 10 cm 7 cm 8 cm 3 Domain 4: Geometry
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