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10.4 Area of a Circle
1.
10.4 Area of a Circle Objective: Find the area of a circle.
Joseph Williams GESD jwilliams@gesd40.org 1
2.
Radius The distance from the center of a circle to any point on the circle.
Image: '1917 D penny' www.flickr.com/photos/96586445@N00/188729710 2
3.
pi the ratio of the circumference of a circle to its diameter. ( 3.14 )
Image: 'Happy 3.14 Day3' www.flickr.com/photos/17731548@N00/421636858 3
4.
Area of a Circle Area = (pi)(radius)2
2 2 A = r A = (3.14)r 3 cm A = (3.14)32 A = 3.14 9 A = 28.26 cm2 4
5.
12 ft.
19 ft. 6 ft Find the area of the key and half circle above the free throw line. 5
6.
Area of the key A = bh A = 19 12 = 228 ft2 Area of the half circle
Now we need to add A = r2 them. A = 3.14 62 = 3.14 36 = 113.04 ft2 We only need the area for half the circle! 228 + 56.52 = 113.04 / 2 = 56.52 ft2 284.52 ft 2 6
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