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It depends on what information you have.
Its the distance from the center of the circle to the edge of the circle.
A radius is half of the diameter of a circle, or the distance from one endpoint to the center.
Align the circle so that the origin of the coordinate plane is the center of the circle, find the radius, and use the area formula for circles (PI•r^2)
No it's made by the circle that how they get the circle not the center.