Let A, B, C, D, E, and F be points on a plane.Explain why 
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Definitions:
Center
In geometry, the central point of a circle or sphere, equidistant from all points on the perimeter or surface.
Radius
A line segment from the center of a circle to any point on its circumference, or the length of this segment.
Equation
A mathematical statement that asserts the equality of two expressions.
Equation
A formula expressing one mathematical quantity in terms of others, indicating equality under certain conditions.
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