Circle P has a radius of 8 units with center P at (-2, 1). Which equation defines circle P?

(x + 2)2 + (y – 1)2 = 8

(x – 2)2 + (y + 1)2 = 8

(x + 2)2 + (y – 1)2 = 64

(x – 2)2 + (y + 1)2 = 64

Question

Circle P has a radius of 8 units with center P at (-2, 1). Which equation defines circle P?

 (x + 2)2 + (y – 1)2 = 8

 (x – 2)2 + (y + 1)2 = 8

 (x + 2)2 + (y – 1)2 = 64

 (x – 2)2 + (y + 1)2 = 64

anonymous · Answer

The standard form of a circle.
(x - x1)^2 + (y - y1)^2 = r^2 where (x1 , y1) are the coordinates of the centre and r is the radius of the circle.