What is the equation of this circle?

Question

anonymous · Answer

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directrix · Answer

The diameter appears to be on the x-axis. Does the circle cut the x-axis at -1 and 3? I'm not sure.

directrix · Answer

If you'll check those numbers, I think I know where the center is. Then, we'll count up and down for the radius and be almost done.

directrix · Answer

(x - h ) ^2 + (y - k) ^2 = r^2

I have the general form for a circle ready.  Just waiting for you to count. Hope your diagram is bigger than mine. :)

mertsj · Answer

The center is (1,0) and the radius is 2 so the equation is :
$$(x-1)^2+(y-0)^2=4$$

anonymous · Answer

Okay so I got no notification at all but thank you both. I actually did it on my own after almost 20 minutes of individual research. I'm bad at geometry. Anyway, thanks!

mertsj · Answer

yw