Question

If the center of a circle is
(-5,8) and a point on the circle is (-5, -4) What is the radius?

Answer 1

The radius is 12.

Explanation:

You're given the center and a point on the circle. The point and the center both have an x-coordinate of -5, so there is no horizontal distance between them. The distance is only in the vertical direction. The distance from 8 to -4 is 12. Since this is the distance from the center to a point on the circle, this equals the radius.