Circle theorum rules

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Angle at the center theorem ->

Angle in a semi circle always adds to a right angle 90 degrees.

A Cyclic Quadrilateral's opposite angles add to 180° :

A "Cyclic" Quadrilateral has every vertex on a circle's circumference.

Tangent Angle A tangent is a line that just touches a circle at one point.

It always forms a right angle with the circle's radius.