Weegy: A. x^2 + y^2 = 3
B. x^2 + y^2 = 9
C. x^2 + y^2 = 81
User: 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?
Weegy: Using pythagors, radius = nsqrt (12^2 + 5^2) = sqrt (169) = 13
User: What is the midpoint of the line segment whose endpoints are (-8, 12) and (-13, -2)?
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