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http://www.mathwarehouse.com/geometry/circle/equation-of-a-circle.php this help?

Kinda but if you look at the picture, the radius is 5 right? 5*5=25 and that's not an answer?

radious is 2 actually

Oh how? :/

cuzz the diameter is 4 and half the diameter is riadius so it 2

take a look at this

(x−h)^2+(y−k)^2=r^2
just plug in
(x−1)^2+(y−0)^2=2^2
then expans and such

(x−1)^2+(y−0)^2=2^2
(x-1)^2+y^2 = 4

Okay awesome, thank you! (: