Find the center and radius of a circle given an equation in standard form.

Name: Find the center and radius of a circle given an equation in standard form.
Brand: Quizplus
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Question

Quizplus · Accepted Answer

The equation of a circle in standard form is $(x-a)^2+(y-b)^2=r^2$, where $(a,b)$ is the center and $r$ is the radius. 
By comparing the given equation to this standard form, we can see that $(x+2)^2+(y-1)^2=4^2$. This means the center is $(-2,1)$ and the radius is $4$. Therefore, the correct choice is $\boxed{	extbf{(C)}}$.

Find the Center and Radius of a Circle Given an Equation