the equation of a circle centered at the origin is x^2+y^2=64.what is the radius of the circle?
A.32
B.8
C.4
D.64

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mreijepatmat mreijepatmat · Answer 1 · 2017-05-03T00:19:24+02:00

EQUATION OF A CIRCLE = (x-h)² + (y-k)² =r²

In this case, since the center of the cercle is in O, then h=0 & k=0

x²+y² = 64

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mohawklover97 mohawklover97 · Answer 2 · 2017-05-03T18:54:38+02:00

the answer is 8, i thought it was 4 but my apex class said 8 was the correct answer.

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