Question

What is the radius of the circle whose equation is x2 + y2 = 9?
81
3
9

Answer 1

3

Explanation:

x^2 + y^2 = 9

The equation of a circle is

(x-h)^2 + (y-k)^2 = r^2

( h,k) is the center and r is the radius

x^2 + y^2 = 3^2

The radius is 3