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Warm Up

Warm Up. Problem of the Day. Lesson Presentation. Lesson Quizzes. Warm Up 1. What is the perimeter of a square with side lengths of 15 in.? 2. What is the perimeter of a rectangle with length 16 cm and width 11 cm?. 60 in. 54 cm. Problem of the Day

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Warm Up

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  1. Warm Up Problem of the Day Lesson Presentation Lesson Quizzes

  2. Warm Up 1. What is the perimeter of a square with side lengths of 15 in.? 2. What is the perimeter of a rectangle with length 16 cm and width 11 cm? 60 in. 54 cm

  3. Problem of the Day Two wibbles equal four wabbles, and eight wabbles equal two bibbles. If a square has a perimeter of 16 wibbles, what is its area in square bibbles? 4 square bibbles

  4. Learn to estimate the area of irregular figures and to find the area of rectangles and parallelograms.

  5. Vocabulary area

  6. The area of a figure is the amount of surface it covers. We measure area in square units.

  7. 2 The area of the figure is about 30 mi . Additional Example 1: Estimating the Area of an Irregular Figure Find the area of the rectangle. Count full squares: 19 red squares. Count almost-full squares: 9 blue squares. Count squares that are about half-full: 4 green squares = 2 full squares. Do not count almost empty yellow squares. Add. 19 + 9 + 2 = 30

  8. The area of the figure is about 18 mi2. Check It Out: Example 1 Estimate the are of the figure. Count full squares: 11 red squares. Count almost-full squares: 5 green squares. Count squares that are about half-full: 4 blue squares = 2 full squares. = mi2 Do not count almost empty yellow squares. Add. 11 + 5 + 2 = 18

  9. A =lw A = 15 •9 A = 135 The area is about 135 in2. Additional Example 2: Finding the Area of a Rectangle Find the area of the figure. Write the formula. 15 in. Substitute 15 for l. 9 in. Substitute 9 for w.

  10. A =lw A = 13 •7 A = 91 Check It Out: Example 2 Find the area of the figure. Write the formula. 13 in. Substitute 13 for l. 7 in. Substitute 7 for w. The area is about 91 in2.

  11. You can use the formula for the area of a rectangle to write a formula for the area of a parallelogram. Imagine cutting off the triangle drawn in the parallelogram and sliding it to the right to form a rectangle. The area of a parallelogram = bh. The area of a rectangle = lw. The base of the parallelogram is the length of the rectangle. The height of the parallelogram is the width of the rectangle.

  12. A = bh 1 __ 1 1 Substitute 2 for b and 1 for h. __ __ A = 2 •1 2 2 4 1 __ 4 5 5 __ __ A = • 2 4 25 1 ___ __ A = or 3 8 8 1 __ The area is 3 ft2. 8 Additional Example 3: Finding the Area of a Parallelogram Find the area of the parallelogram. Write the formula. 1 1 ft 4 1 2 ft 2 Multiply.

  13. A = bh 1 3 ft 2 1 1 1 __ __ __ A = 1 •3 Substitute 1 for b and 3 for h. 2 2 2 1 __ 2 1 1 ft 3 7 __ __ 2 A = • 2 2 21 1 ___ __ A = or 5 4 4 1 __ The area is 5 ft2. 4 Check It Out: Example 3 Find the area of the parallelogram. Write the formula. Multiply.

  14. To find the area to be tiled, subtract the area of the island from the area of the floor. 221 – 18 = 203 The area of the kitchen to be tiled is 203 ft2. Additional Example 4: Recreation Application Jessika is going to tile a kitchen that measures 13 ft by 17 ft. Some floor space is taken up by an island that measures 3 ft by 6 ft. How much area remains to be tiled in the kitchen? – = floor area island kitchen area to be tiled Substitute for l and w in A = lw. – = (13 • 17)‏ (3 • 6)‏ n Use the order of operations.

  15. To find the landscaped area, subtract the area of the BBQ from the area of the backyard. 176 – 8 = 168 The area of the backyard to be landscaped is 168 ft2. Check It Out: Example 4 Miguel is going to landscape his backyard that measures 16 ft by 11 ft. Some of the backyard space is taken up by a built-in BBQ that measures 2 ft by 4 ft. How much area remains to be landscaped? – = backyard area BBQ landscaped area Substitute for l and w in A = lw. – = (16 • 11)‏ (2 • 4)‏ n Use the order of operations.

  16. Lesson Quizzes Standard Lesson Quiz Lesson Quiz for Student Response Systems

  17. 41.4 m2 48 ft2 160 in2 288 ft2 Lesson Quiz Find the area of each figure. 1. 2. 3. What is the area of a parallelogram with base 16 in. and height 10 in.? 4. A square fish pond that is 6 ft long is surrounded by a square walk that is 18 ft long. What is the area covered by the walk?

  18. Lesson Quiz for Student Response Systems 1. Find the area of the figure. A. 53.9 m2B. 53.9 m2 C. 54.6 m2D. 54.9 m2

  19. Lesson Quiz for Student Response Systems 2. Find the area of the figure. A. 60 ft2B. 70 ft2 C. 80 ft2D. 90 ft2

  20. Lesson Quiz for Student Response Systems 3. Find the area of a parallelogram with base 19 ft and height 11 ft. A. 209 ft2B. 214 ft2 C. 216 ft2D. 220 ft2

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