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1 Perimeter, Circumference and Area tion.com/?blnPreviewOnly= 1&guidAssetId=6e7387cf- 1b6c ce3- d9d8dbc34682blnPreviewOnly= 1&guidAssetId=6e7387cf- 1b6c ce3- d9d8dbc34682

2 Perimeter and Circumference Perimeter : The distance around a geometric figure. Circumference: The distance around a circle.

3 Perimeter To find perimeter add the lengths of all the sides. – Example: Find the perimeter of the polygon 8 in 6 in 8 in 6 in P = P = 28 The perimeter is 28 in

4 Perimeter – Example : Find the perimeter of the triangle 12 in 16 in P = P = 40 The perimeter is 40 in

5 Your Turn…. Find the perimeter pg. 426 #1-3 ( 3 minutes) Make sure that there are no naked numbers. 1. P = P = 18m 2. P = P = 24in 3. P = P = 32 ft

6 Circumference To find the circumference multiply times diameter, where is 3.14 C = d Diameter

7 Definitions Diameter (d): a line that passes through the center of a circle Radius (r): half the diameter d = 20, then r = 10 r = 15, then d = 30

8 Circumference Example: Find the circumference Diameter = 8 in Circumference = d C = 3.14(8) C = The circumference is in

9 Circumference Example: Find the circumference radius = 10 cm Circumference = d Diameter = 2r = 2 (10) = 20 C = 3.14(20) C = 62.8 The circumference is 62.8 cm

10 Your Turn…. Find the circumference pg. 426 # 7-9 No naked numbers. 7. C = d 8. C = d C = 3.14(12) C = 3.14(3) C = 37.7m C = 9.4 ft 9. C = d C = 3.14 (16) C = in

11 Area of Rectangles The area of a rectangle is the product of its length and width. A = ω ω

12 Area of Rectangles Find the area of the rectangle 10 ft 7.5 in A = ω A = 10(7.5) A = 75 ft² The area is 75 ft²

13 Area of Triangles The area of a triangle is half the product of its base b and its height h. A = bh height base

14 Area of Triangles Example: Find the area of the triangle 6 in 5 in A = bh A = 5(6) A = 15 in ²

15 Area of Circles The area of a circle is the product of and the square of the circle’s radius r. A = r² radius

16 Area of Circles Example: Find the area of the circle r = 3 m A = r² A = 3.14(3)² A = 3.14(9) A = m ² The area of the circle is 28.26m ²

17 Area of Circles d = 8 in A = r² Radius = 4 in A = 3.14(4)² A = 3.14(16) A = in² The area of the circle is 50.24in²

18 Lets Review Perimeter = Sum of all sides Circumference = d Area of a Rectangle = ω Area of a Triangle = bh Area of a Circle = r²


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