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May 19, 2013

# Homework Help: math

Posted by Kim on Sunday, October 10, 2010 at 5:21am.

find the equation of the circle passing through (-1,2)(2,6)(6,3)

• math - drwls, Sunday, October 10, 2010 at 6:09am

A general equation could be written:
(x-a)^2 + (y-b)^2 = c^2
where c is the radius of the circle.
You can use the coordinates of the three given points to get three equations in three unknowns.
(-1-a)^2 + (2-b)^2 = c^2
(2-a)^2 + (6-b)^2 = c^2
(6-a)^2 + (3-b)^2 = c^2
Then solve for a, b and c

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