The standard equation of a circle is (x-h)²+(y-k)²=r², (h,k) is the center, r is the radius. You have the center (0,-8), you need the radius. the radius is the distance between the center and any point on the circle. use the distance formula, r=√(2-0)²+(-5-(-8))²=√13 so the equation is x²+(y+8)²=13
