Question

Which is an equation of the circle with a radius of 9 units and center at (-4,2)?

Answer 1

`(x+4)^2+(y-2)=81`

Explanation:

This is the center radius form

`(x-h)^2+(y-k)^2=r^2`

with the given radius `r=9` and center at `(-4, 2)`

`(x--4)^2+(y-2)^2=9^2`

`(x+4)^2+(y-2)^2=81`

God bless....I hope the explanation is useful.