Question

What is the equation of a circle whose center is at the origin and whose radius is 16?

a) x^2 + y^2 = 4
b) x^2 + y^2 = 16
c) x^2 + y^2 = 256

Answer 1

The equation of a circle is (x-a)^2+(y-b)^=r^2 which a and b are the horizontal and vertical displacement of the center from the origin and r is the radius. You can figure the rest out

Answer 2

a is the answer