Question

what is the circumference of the circle x^2+y^2-10y-36=0?

a. 38
b. 49
c. 54
d. 125
e. 192

Answer 1

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

Answer 2

heard about completing the square ?

Answer 3

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

Answer 4

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

Answer 5

sure, go ahead :)

Answer 6

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

Answer 7

sqrt of 10?