Area of circles and shaded regions?

label Mathematics
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Im supposed to do 29-31 and i have no clue how too. Someone pick one and try to explain please? 

Feb 12th, 2015

29.

Area of square = 4

Area of circle whose radius is 1 = pi*1*1 = pi = 3.14

Area of shaded figure = 4-3.14 =0.86 sq ft

30.

Area of square = 64

Area of two semicircles with radius 4 = pi*4*4= 16 pi = 16*3.14

Area of shaded region = 16(4-3.14) = 16*0.86 = 13.76 sq ft

31.

Side =28 in

Area of square = 28*28 =784

Area of 4 quadrants = pi *14*14 = 196 *pi

Area of shaded region = 196(4-3.14) = 196* 0.86=168.56 sq in


Feb 12th, 2015

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Feb 12th, 2015
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