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Definition of a Circle
highA circle is the set of all points in a plane that are at the same distance from a fixed point called the centre. This fixed distance is called the radius.
When a radius is drawn to a point on the circle, immediately mark it equal to every other radius from the same centre.
Symmetries of a Circle
highA circle has reflection symmetry about every diameter and rotational symmetry about its centre for any angle of rotation.
For symmetry questions, check whether the line passes through the centre. A chord not passing through the centre is not a line of symmetry of the whole circle.
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