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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eliassaab
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\[
x^2+y^210y36=0\\
x^2+y^210y+25 2536=0\\
x^2 +(y5)^2 = 61=r^2\\
r=\sqrt{61}\\
\]

eliassaab
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\[
2 \pi r = 2 \pi \sqrt{61}=49.0732
\]

eliassaab
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It seems b is the answer

jmiller22
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Yes it is B.49

stupidinmath
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oh, thanks!