# Mathematics Circle Theorems - Part 3 (Geometry)

A circle is one of the most common shapes and universal too. But not to forget, it's also one of the most important shape in geometry. This video Covers certain tricks to understand circle theorems and also covers the basics knowledge required before solving a theorem.

This video covers the proofs of following theorems:
1. Angles in the same segment of a circle.
2. If a line segment joining two points subtends equal angles at two other points lying on the same side of the line containing the line segment the four points lie on a circle (i.e. they are concyclic)
3. The sum of either pair of opposite angles of a cyclic quadrilateral is 180 degrees.
4. If the sum of a pair of opposite angles of a quadrilateral is 180 degrees, the quadrilateral is cyclic.

Well, you may also like to these videos related to Circle:

Circles for Beginners

Circle Theorems - Part 1

Circle Theorems - Part 2

Tangent to a Circle

Areas Related To Circle - Part 2

Areas Related To Circle - Part 1

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