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In order to write the standard form equation for a circle, we need to know two things: the coordinates of the center and the length of the radius. The standard form equation is (x  h)^2 + (y  k)^2 = r^2 where the center is (h,k) and the radius is r. From a graph, we identify the coordinates of the center, and then count the radius units either horizontally or vertically and substitute values into the equation.
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Concept (1)
Sample Problems (11)
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The Circle
Problem 1 11,334 viewsEquation for a circle centered at (1,2) with radius 5.

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Problem 2 8,862 viewsGive the center and radius of the circle defined by
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Problem 4 8,070 viewsFind the equation of a circle that has a diameter with endpoints at (3,1) and (5,5).

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