IA2.GR.C.9: Create the equation of a circle given the center and radius; identify the center and radius of a circle given the equation.

Create the equation of a circle given the center and radius; identify the center and radius of a circle given the equation.

Example Problems

The center of the circle is

(30, -40)

.

The equation of a circle is given below.

(x + 4)^{2} + (y - 11)^{2} = 64

What is its center?

The equation of a circle is given below.

(x + 13)^{2} + (y - 1)^{2} = 10

What is its center?

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