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Mathematics 13 Online
OpenStudy (anonymous):

A circle whose center is at the origin passes through (3,2). Find the length of its radius.

hartnn (hartnn):

A circle passing through center has equation \[x ^{2}+y ^{2}=r ^{2}\] where r is the radius now u have a point(x,y)=(3,2) just put that in the equation and find the radius

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