If the coordinates of the endpoints of a diameter of the circle are​ known, the equation of a circle can be found.​ First, find the midpoint of the​ diameter, which is the center of the circle. Then find the​radius, which is the distance from the center to either endpoint of the diameter. Finally use the​ center-radius form to find the equation.   Find the​ center-radius form for the circle having the endpoints (5,8) and (−9,2) of a diameter.

Algebra and Trigonometry (MindTap Course List)
4th Edition
ISBN:9781305071742
Author:James Stewart, Lothar Redlin, Saleem Watson
Publisher:James Stewart, Lothar Redlin, Saleem Watson
Chapter1: Equations And Graphs
Section1.CR: Chapter Review
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If the coordinates of the endpoints of a diameter of the circle are​ known, the equation of a circle can be found.​ First, find the midpoint of the​ diameter, which is the center of the circle. Then find the​radius, which is the distance from the center to either endpoint of the diameter. Finally use the​ center-radius form to find the equation.
 
Find the​ center-radius form for the circle having the endpoints
(5,8)
and
(−9,2)
of a diameter.
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