Question

What is the equation in standard form

Answer 1

The standard form of the circle equation is in the format (x – h)^2 + (y – k)^2 = r^2, with the center being at the point (h, k) and the radius being "r". 
In this case, the center is at the origin, so h=0, k=0, r^2=5
so x^2+y^2=5