stupidinmath
what is the circumference of the circle x^2+y^210y36=0?
a. 38
b. 49
c. 54
d. 125
e. 192



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hartnn
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so you need radius right ?
i think you know how to find Circumference from radius

hartnn
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heard about completing the square ?

hartnn
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y^2 10y +a
can you find 'a' such that y^210y +a
is a perfect square ?

dpasingh
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Hi @hartnn if you allow me, i complete the answer..

hartnn
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sure, go ahead :)

hartnn
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y^2 10y +a
can you find 'a' such that y^210y +a
is a perfect square ?

stupidinmath
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sqrt of 10?