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Mathematics 21 Online
OpenStudy (anonymous):

PLEASE hep?? :)

OpenStudy (anonymous):

OpenStudy (agent47):

well, so suppose those 2 quarters of a circle are from the whole circle of radius 10. Then The area of that circle would be pi*r^2= pi*10^2=100pi. Half of that would be 50pi, so the area of the white regions is 50pi.

OpenStudy (agent47):

I got that from the fact that two quarters of a circle make a semicircle. So now, subtract 50pi from the area of the rectangle which is: (10+10)*10=20*10=200

OpenStudy (agent47):

200-50pi = 200-50*3.14 which is about 43

OpenStudy (agent47):

square feet

OpenStudy (anonymous):

FINAL ANSWER? THANK YOU SO MUCH :)

OpenStudy (anonymous):

Whoops, sorry abiut the caps!

OpenStudy (agent47):

43

OpenStudy (anonymous):

At=A(rectangle) - A[1/2 circle] = LxW - 1/2(pi r^2) =10x20 - 1/2(PIx10^2) = 200-157 =43 sq ft

OpenStudy (anonymous):

did that help maybe

OpenStudy (anonymous):

yes

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