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Area of any circle = pi*radius2
The circumference of any circle is (pi) x (the circle's diameter).
a chord of the circle
Yes. Actually, a circle has an infinite number of lines of symmetry.
If you're only given two points, and you're told that they both lie on a circle,then there are an infinite number of possible circles, and therefore an infinitenumber of possible centers. In order to pin it down, you need three points.