Question

Write the standard equation of a circle with center (0,0) and radius 7

Answer 1

x^2 + y^2 = 49

Explanation:

For center (h,k) and radius r, eqution of the respective circle is

(x-h)^2 + (y-k)^2 = r^2

Answer 2

x² + y² = 49

Explanation:

(x - 0)² + (y - 0)² = 7²

x² + y² = 49