Write the standard form of the equation of the circle with the given center and radius.
-$$( 5,7 ) ; 9$$
A) $( x - 5 ) ^ { 2 } + ( y - 7 ) ^ { 2 } = 81$
B) $( x + 5 ) ^ { 2 } + ( y + 7 ) ^ { 2 } = 81$
C) $( x - 7 ) ^ { 2 } + ( y - 5 ) ^ { 2 } = 9$
D) $( x + 7 ) ^ { 2 } + ( y + 5 ) ^ { 2 } = 9$

Question

Quizplus · Accepted Answer

The standard form of the equation of a circle is $(x - h)^2 + (y - k)^2 = r^2$, where $(h, k)$ is the center and $r$ is the radius. Given the center $(5, 7)$ and radius $9$, the equation is $(x - 5)^2 + (y - 7)^2 = 81$, where $81$ is $9^2$.

Write the Standard Form of the Equation of the Circle (5,7);9( 5,7 ) ; 9(5,7);9

Write the Standard Form of the Equation of the Circle $( 5,7 ) ; 9$