Question

Which of the following is the equation of the circle with center (2, -1) and r = 8?

(x + 2)2 + (y - 1)2 = 8

(x - 2)2 + (y + 1)2 = 64

(x + 2)2 + (y - 1)2 = 64

(x - 2)2 + (y + 1)2 = 8

Answer 1

\[\left( x-h \right)^2+\left( y-k \right)^2=r^2,centre~ (h,k),~and~ radius=r\]