The standard form of equation of the circles with coordinates (0,0) as its center

Answer 1

standard equation for a circle with center (h,k) and radius = r

is: (x-h)^2 + (y-k)^2 = r^2. if the center is the origin then h=k = 0

(x-0)^2 + (y-0)^2 = r^2

x^2 + y^2 = r^2

Answer 2

x² + y² = r² where r is the radius