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OpenStudy (anonymous):
Ugh - please help me find the radius of this. x squared + y squared -4x-16y-9=0
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OpenStudy (anonymous):
I know the center is (2,8)
OpenStudy (anonymous):
but finding the square root radius is giving me a headache
OpenStudy (anonymous):
r = √(9 + (16/2)² + (4/2)²) r = √(9 + 8² + 2²) r = √(9 + 64 + 4) r = √77
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