Question

A circle is shown on the coordinate plane below.



What is the equation of this circle?

Answer 1

This is the circle of radius 2 centered at (1,0).

The equation for the circle is:

(x-1)^2 + y^2 = 4

Answer 2

how did you get that?

Answer 3

(x−h)^2+(y−k)^2=r^2

Where, r is the radius, h is the x coordinate of the center, and k is the y coordinate of the center.

Answer 4

Oh! Thank you!!

Answer 5

No problem. Good luck :)

Answer 6

Oh, here's a neat little webpage that goes into a good amount of detail:

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