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Mathematics 18 Online
OpenStudy (anonymous):

Which is the equation of a circle whose radius is 12 and its center is at the origin of the coordinate plane?

OpenStudy (anonymous):

Eq for circle \[x ^{2} + y ^{2} = r ^{2}\] where r is the radius. So for a circle with radius 12, plug in 12 for r giving \[x ^{2} + y ^{2} = 12 ^{2} = 144\]

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