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The circumference of circle x^(2)+y^(2)-...

The circumference of circle `x^(2)+y^(2)-10y-36=0` is

A

38

B

49

C

54

D

125

Text Solution

Verified by Experts

The correct Answer is:
B
Complete the square to get `x^(2)+(y-5)^(2)=61`.
Radius `=sqrt(61).C=2pir=2pisqrt(61)~~49.`
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