Question

The point (−3, 2 ) lies on a circle whose

equation is ( x + 3) + ( y + 1) = r 2 . Which of

the following must be the radius of the circle?

3

A

B

10

C

9

10

D

Answer 1

You mean (x + 3)^2 + (y+1)^2 = r^2, right? Plug in the values for x and y, to get:
0^2 + 3^2 = r^2 -> r^2 = 9 -> r = 3, because the radius must be positive.

Answer 2

a

Answer 3

no... thats the equation that was on my math pg

Answer 4

thnx Mit :)