A circle with center (0, 0) passes through the point (5, 12). How do you find the radius of the circle?
The radius is simply the distance from the center to the edge, and we can use Pythagoras' Theorem to calculate that for this circle the radius is
The radius is simply the distance from the center to the edge. We know the center is at
We can do this because
Taking the square root of both sides,