radius of circle

In a circle a 90 degree sector has an area of 64 ii ft2.  What is the radius of the circle?
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1 Answer

90 deg sekter av serkel=1/4 av a serkel

area=(1/4)pi*r^2=64

serkel area=4*64=256=pi*r*r

r^2=256/pi=256/3.14159 =81.487399969

r=sq root(81.487399969)

r=9.02737...
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