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OpenStudy (anonymous):
what is the circumference of the circle x^2+y^2-10y-36=0? a. 38 b. 49 c. 54 d. 125 e. 192
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hartnn (hartnn):
so you need radius right ? i think you know how to find Circumference from radius
hartnn (hartnn):
heard about completing the square ?
hartnn (hartnn):
y^2 -10y +a can you find 'a' such that y^2-10y +a is a perfect square ?
OpenStudy (anonymous):
Hi @hartnn if you allow me, i complete the answer..
hartnn (hartnn):
sure, go ahead :)
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hartnn (hartnn):
y^2 -10y +a can you find 'a' such that y^2-10y +a is a perfect square ?
OpenStudy (anonymous):
sqrt of 10?
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