Question

The equation of the circle whose center is (0, 3) and radius is length 4 is

x² + (y - 3)² = 8
x² + (y - 3)² = 16

Answer 1

Here we are taking the coordinates and turning into into an equation.

To find r, take the radius (4) and square it.

x^2 + (y-3)^2 = 16