Geometry: Perimeter and Area

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Presentation transcript:

Geometry: Perimeter and Area Lesson 6-8 Pages 270-273 Geometry: Perimeter and Area

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

Vocabulary Perimeter Formula Area

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.

9 units 5 5 units 9 Perimeter = 28 units

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

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

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

Area = 45 units2 9 units 5 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

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

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

Page 272 Guided Practice #’s 3-7

Homework: Page 272-273 #’s 8-28 even #’s 30-43

Page 579 Lesson 6-8