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

Answer:
A. x^2 + y^2 = 4^2
Step-by-step 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:
A
Step-by-step 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.