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Mathematics 31 Online
OpenStudy (ksaimouli):

Find the equation of the circle: circle with center (1,2) that passes through point (-2,-1)?

OpenStudy (anonymous):

you know it looks like \((x-1)^2+(y-2)^2=r^2\) so all you need is \(r^2\) which is the square of the distance between \((1,2)\) and \((-2,-1)\)

OpenStudy (anonymous):

use the distance formula without the annoying square root to find \(r^2\)

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