1. Geometry: Perimeter and Area
Lesson 6-8 Pages
Geometry: Perimeter and Area

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

3. Vocabulary
Perimeter
Formula
Area

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

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

9. Area = 45 units2 9 units 5 units 1 2 3 4 5 6 7 8 9 10 11 12 13 14 1516 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. Area = l × w Area = 9 × 5 Area = 45 units2 Length (9 units) Width

12. Page 272
Guided Practice
#’s 3-7

14. Homework: Page
#’s 8-28 even
#’s 30-43

18. Page
579
Lesson 6-8