Question

Can somebody help me?

Answer 1

do you know the distance formula?

Answer 2

d=(x2-x1)^2 + (y2-y1)^2

Answer 3

@Loser66

Answer 4

lack of square root?

Answer 5

oh yea

Answer 6

ok, just plug them in and find out the distance between the 2 points. That is the radius of the circle, right?

Answer 7

okay I think I got it... is it C

Answer 8

nope. the distance is 10, and then if you apply to the equation of the circle, it should be ??? surely not c

Answer 9

try one more.:)

Answer 10

A?

Answer 11

what is the equation of the circle?

Answer 12

no clue... how do I put the number I got into the equation for the circle?

Answer 13

of course!! the equation of the circle is (x -h)^2 +(y-k)^2= r^2
I don't care about the left hand side. Just do the right hand side (because you can take advantage from distinct value of r. They are all different)
The right hand side = the radius ^2 . And you have the radius calculated above is 10, so 10^2 =??
I am cheating, but it works

Answer 14

That is the trick to save time on test.

Answer 15

100?

Answer 16

how many options have the 100 in?

Answer 17

1... D

Answer 18

take it!! why not? right?

Answer 19

true thanks

Answer 20

ok