Question

This circle is centered at the origin, and the length of its radius is 4. What is the equation of the circle?​

Answer 1

A. x^2 + y^2 = 4^2

Explanation:

The equations of a circle is x^2 + y^2 = r^2

Therefore, the equation of this circle is x^2 +y^2 = 4^2

Answer 2

A

Explanation:

Remark

The formula for a circle is

x^2 + y^2 = r^2

The number associated with x^2 and y^2 must always be 1. If it's not then you do not have a circle.

Answer

The answer to this question is x^2 + y^2 = 4^2 where r = 4 and it is squared.