Question

What is the radius for a circle whose equations is x^2+y^2=64

Answer 1

8

Explanation:

To write the equation of a circle, use the formula
`(x-h)^2+(y-k)^2 = r^2` where the center of the circle is (h, k).

This means the equation is
`x^2 + y^2 = 64` has
`r^2 = 64`. This means the radius is √64 = 8.