A radius is not a point but a line segment. The question is, therefore, rather confused.
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You can completely specify a circle in a plane by giving the coordinates of its center point, and the length of the radius.
Just like any other circle, the area of that one is (pi) times (the square of the radius).
The radius of a circle is from the middle to the edge, or half the diameter. The circumference is like the perimeter of the circle, and the formula is pi times the diameter.
A=pi x radius squared Example: circle with a radius of 2 would be worked out like this: 2 squared (4) x 3.14. Answer= 12.56
Basically a circle has a constant radius throughout and an ellipse does not.a circle has a constant radiusan ellipse has two foci. they are at either end of the ellipse