Question

Find the equation of circle whose center is at origin and radius 4 units.​

Answer 1

The equation of a circle with centre at (h, k) and radius equal to a, is (x - h)2 + (y - k)2 = a2. When the centre of the circle coincides with the origin i.e., h = k = 0.

Answer 2

5 is the answer for your questionm