Equations of CirclesWhen center is (0, 0): x + y = r when center is not (0, 0): (x - h) + (y - k)

Equations of CirclesWhen center is (0, 0): x² + y² = r² when center is not (0, 0): (x - h)² + (y - k)² = r²Write the equation of a circle with center (0, 0) and a radius of 15.