1 / 23

Warm Up

Warm Up. Problem of the Day. Lesson Presentation. Lesson Quizzes. Warm Up Find each product. 1. 8  12 2. 3 3. 9.4  6.3 4. 3.5  7. 96. 1 3. 2 3. 1 2. 18.  5. 59.22. 24.5. Problem of the Day

kirsi
Download Presentation

Warm Up

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

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

  2. Warm Up Find each product. 1. 8  12 2. 3 3. 9.4  6.3 4. 3.5  7 96 1 3 2 3 1 2 18  5 59.22 24.5

  3. Problem of the Day How many 3 ft by 2 ft rectangles can you cut from one 8 ft by 4 ft rectangle? How much will be left over? 5 pieces; 2 ft2 left over

  4. Learn to find the area of rectangles and other parallelograms.

  5. Vocabulary area

  6. The area of a figure is the number of unit squares needed to cover the figure. Area is measured in units of length squared, or square units.

  7. Additional Example 1: Finding the Area of a Rectangle Find the area of the rectangle. 4.5 in. 7.4 in. A = lw Use the formula. Substitute for l and w. A = 7.4 · 4.5 Multiply. A = 33.3 The area of the rectangle is 33.3 in2.

  8. Check It Out: Example 1 Find the area of the rectangle. 6.3 in. 8.2 in. A = lw Use the formula. Substitute for l and w. A = 8.2 · 6.3 Multiply. A = 51.66 The area of the rectangle is 51.66 in2.

  9. Additional Example 2: Finding Length or Width of a Rectangle The area of a playing field is 1,470 ft2 and the length is 42 ft. What is the width of the field? Use the formula for the area of a rectangle. A = lw 1,470 = 42 · w Substitute 1,470 for A and 42 for l. 42 · w 42 1,470 42 = Divide both sides by 42 to isolate w. 35 = w The width of the playing field is 35 ft.

  10. Check It Out: Example 2 The area of a rectangular parking lot is 3,570 ft2 and the width is 70 ft. What is the length of the parking lot? Use the formula for the area of a rectangle. A = lw 3,570 = l · 70 Substitute 3,570 for A and 70 for w. 3,570 70 70 · w 70 = Divide both sides by 70 to isolate w. 51 = l The length of the parking lot is 51 ft.

  11. Additional Example 3: Finding the Area of a Parallelogram Find the area of the parallelogram. A = bh A = 16 · 8 8 m A = 128 16 m The area of the parallelogram is 128 m2.

  12. Check It Out: Example 3 Find the area of the parallelogram. A = bh A = 12 · 6 6 cm A = 72 12 cm The area of the parallelogram is 72 cm2.

  13. 4 yd 5 yd Additional Example 4: Measurement Application A carpenter is laying a wood floor measuring 4 yd by 5 yd. How many square feet of flooring material does she need? First draw and label a diagram. Look at the units. The wood floor is measured in yards, but the answer should be in square feet. Convert yards to feet by using a conversion factor.

  14. Additional Example 4 Continued Now find the area in square feet. Use the formula for the area of a rectangle. A = lw A = 15 · 12 Substitute 15 for l and 12 for w. A = 180 Multiply. She needs 180 ft2 of flooring material.

  15. 6 yd 8 yd Check It Out: Example 4 A carpenter is laying a wood floor measuring 6 yd by 8 yd. How many square feet of flooring material does he need? First draw and label a diagram. Look at the units. The wood floor is measured in yards, but the answer should be in square feet. Convert yards to feet by using a conversion factor.

  16. Check It Out: Example 4 Continued Now find the area in square feet. Use the formula for the area of a rectangle. A = lw A = 24 · 18 Substitute 24 for l and 18 for w. A = 432 Multiply. He needs 432 ft2 of flooring material.

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

  18. 105 8 1 8 in2 or 13 57 2 or 1 2 ft2 28 Lesson Quiz: Part I Find the area of each figure. 1. 2. 3. 24.5 ft2 4. 84 ft2

  19. Lesson Quiz: Part II 5. Diego is building a rectangular platform measuring 36 in. by 54 in. What is the area of the platform in square feet? 13.5 ft2

  20. Lesson Quiz for Student Response Systems • 1. Identify the area of the rectangle. • A. 28.09 cm2 • B. 28.6 cm2 • C. 47.7 cm2 • D. 81 cm2 9 cm 5.3 cm

  21. Lesson Quiz for Student Response Systems • 2. Identify the area of the parallelogram. • A. 144 in2 • B. 72 in2 • C. 50 in2 • D. 25 in2

  22. Lesson Quiz for Student Response Systems • 3. Marcheline is building a wooden deck measuring 192 in. by 144 in. What is the area of the platform in square feet? • A. 192 ft2 • B. 27,648 in2 • C. 28 ft2 • D. 32 ft2

More Related