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OpenStudy (anonymous):
A circle has its center at the origin, and (5, -12) is a point on the circle. How long is the radius of the circle?
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OpenStudy (asadkarim7):
apply distance formula sqrt(x2-x1)^2 + ( y2-y1)^2
OpenStudy (anonymous):
Circle is x^2 + y^2 = r^2 so 25 +144 = r^2, r = 13.
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