Question

The circle below is centered at the origin and has a radius of 4. What is its equation?

Answer 1

Answer:

C) x^2 + y^2 = 16

Step-by-step explanation:

Find the equation

since the radius is  4 this means that anywhere from the center of the circle to the edge of the circle is 4. hence :

place the horizontal line of the radius where y = 0 .

this means that if y = 0 , then x = 4

therefore :

x^2 + y^2

4^2 + 0^2

= 16

hence the answer is C ) x^2 + y^2 = 16