Question

Select the correct answer.

Circle F is represented by the equation (x + 6)² + (y + 8)2 = 9. What is the length of the radius of circle P?
A. 3
B. 9
C.10
D.81

Answer 1

The radius should be 3 and the center is (-6,-8)

Answer 2

A. 3

Explanation:

The standard equation of a circle is:
`(x-h)^2+(y-k)^2=r^2`.

In this question, you're asked to find the length of the radius. The r^2 given in this equation is 9, so to find the radius, you square root the 9.

`r^2=9\\√(r^2) =√(9)\\ r=3`

Therefore, the length of the radius equals 3, or A.