Geometry
 Circle: Circle is a simple closed curve.

 The fixed point O is the centre of the circle.

 The fixed distance OP = OQ is the radius of the circle.

 The distance around the circle is its circumference.

 A line joining any two points on a circle is known as chord. In the given figure, RS and PQ are the chords.

 The chord passing through the centre of a circle is called diameter. The diameter of a circle divides it into two semicircles.

 The diameter of a circle is the longest chord of the circle …
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