Question

The equation of a circle is shown below. Determine the radius.

(x − 1)2 + (y + 1)2 = 121

A. 9
B. 10
C. 11
D. 12


I did the equation and now I have x^2-y^2=121. What do I do from here?

Answer 1

http://www.regentsprep.org/Regents/math/algtrig/ATC1/circlelesson.htm

Answer 2

\(\normalsize\color{blue}{ (x-h)^2+(y-k)^2=r^2\LARGE\color{white}{ \rm │ }}\) where ` r `is the radius.

Answer 3

Compare your's to it.

Answer 4

so you have to find the square root of 121 to find radius

Answer 5

Oh! So, 11?

Answer 6

yes

Answer 7

yEs !

Answer 8

Thank you guys so much!!

Answer 9

\(\ddot\smile\)