Question

The diameter of a circle has endpoints whose coordinates are R(-2, 2) and S(4, 2). Find the equation of the circle.

Answer 1

( x- ? )^2+(y- ? )^2 = ?

Answer 2

Well, you can calculate the diameter pretty easily by the pythagorean theorem, or the "distance formula" if you prefer to think of it that way. But they are the same thing.
Once you know the diameter, it's simple to find the radius.

Answer 3

Okay, well usually you would want to use the pythagorean theorem. In this case, it's simpler than that because they have the same y value. WHat is the distance between those two points?

Answer 4

I got (x - 4)^2+ (y-2)^2 =9 and it said partial credit

Answer 5

5

Answer 6

= 9 is correct because the radius is 3.
Where is the center of that circle? It should be halfway between those two points.

Answer 7

is the 4 and 2 both wrong or what im still kinda lost

Answer 8

Slow down and ask yourself where the center of the circle is. Look at the picture and see if your answer makes sense.