Equation of Circles: An introduction
Identify the center and radius of circle A above.
center: (-2, 1), radius = 2
The general form of the equation of a circle
If that doesn't help, watch this video.
Create your own
Draw a circle with radius 3 units
Write the equation.
Identify the center and radius of the circle you drew above.
equation
Now write the equation of the circle above.
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Information: Equation of Circles: An introduction