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Lesson 6-8 Pages 270-273

Lesson 6-8 Pages 270-273. Geometry: Perimeter and Area. Lesson Check 6-7. What you will learn!. How to find the perimeters and areas of figures. Vocabulary. What you really need to know!.

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Lesson 6-8 Pages 270-273

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  1. Lesson 6-8 Pages 270-273 Geometry: Perimeter and Area Lesson Check 6-7

  2. What you will learn! How to find the perimeters and areas of figures.

  3. Vocabulary

  4. What you really need to know! The distance around a geometric figure is called the perimeter. To find the perimeter of any geometric figure, add the measures of its sides.

  5. 9 units 5 5 units 9 Perimeter = 28 units

  6. What you really need to know! The perimeter of a rectangle is twice the length l plus twice the width w. P = 2l + 2w

  7. 9 units P = 2l + 2w P = 2×9 + 2×5 5 5 units P = 18 + 10 P = 28 9 Perimeter = 28 units

  8. What you really need to know! The measure of the surface enclosed by a geometric figure is called thearea.

  9. 9 units 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 5 units 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 Area = 45 units2

  10. What you really need to know! The area of a rectangle is the product of the length l and width w. A= L × W

  11. Length (9 units) Width (5 units) Area = l× w Area = 9 × 5 Area = 45 units2

  12. Example 1: 40 ft Find the perimeter of the rectangle: 18 ft 2 ft P = 2l + 2w P = 2•18 + 2•2

  13. Example 2: Find the perimeter:

  14. Example: 3 Find the area of the surface of the reservoir shown below. A = lw 5/8 mi 4 mi

  15. Page 272 Guided Practice #’s 3-7

  16. Read: Pages 270-271 with someone at home and study examples!

  17. Homework: Page 272-273 #’s 8-28 even #’s 30-43 Lesson Check 6-8

  18. Page 579 Lesson 6-8

  19. Lesson Check 6-8

  20. Homework: Page 272-273 #’s 8-17, 23-27 all #’s 30-43

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