Question

The equation for the circle below is x2 + y = 100. What is the length of the
circle's radius?

Answer 1

The radius of the circle is 10.

The equation of a circle is (x-h)^2 + (y-k)^2 = r^2, where (h,k) is the center and r is the radius. Luckily we’re only worried about the radius, so we have:

r^2 = 100, or r = 10.