Write the equation of the circle with the given center and radius.
-Center (0, 0),radius 3
A) $x ^ { 2 } - y ^ { 2 } = 3$
B) $x ^ { 2 } + y ^ { 2 } = 6$
C) $x ^ { 2 } + y ^ { 2 } = 9$
D) $x ^ { 2 } + y ^ { 2 } = 3$

Question

Quizplus · Accepted Answer

The equation of a circle with center at the origin (0,0) and radius r is $x^2 + y^2 = r^2$. For a radius of 3, $r^2 = 3^2 = 9$, so the equation is $x^2 + y^2 = 9$.

Write the Equation of the Circle with the Given Center x2−y2=3x ^ { 2 } - y ^ { 2 } = 3x2−y2=3

Write the Equation of the Circle with the Given Center $x ^ { 2 } - y ^ { 2 } = 3$