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OpenStudy (anonymous):
The equation for the circle below is x2 + y2 = 64. What is the length of the circle's radius?
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OpenStudy (anonymous):
\[x^2+y^2 = r^2\] is the form of the equation with r = radius
OpenStudy (anonymous):
is it 9?
OpenStudy (anonymous):
yea
OpenStudy (anonymous):
No, \[r^2 = 64\] so what does r equal?
OpenStudy (whpalmer4):
no...what number * itself gives you 64?
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OpenStudy (anonymous):
8
OpenStudy (anonymous):
Correct
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