# Geometry

A diameter of a circle has endpoints P(-10, -2) and Q(4, 6).

a. Find the center of the circle.

c. Write an equation for the circle.

Can someone explain how to do this?

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1. the center of the circle is the midpoint of the diameter: (-3,2)
The length of the diameter is √(14^2+8^2) = √260 = 2√65

That means the equation is
(x+3)^2 + (y-2)^2 = 65

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posted by Steve

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