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Circle theorems

Circle theorem

TermDefinition
Angles at the centre Are twice the size than the angles of the circumference
Angles in the same segment standing on the same chord Are equal
Angles in a semicircle Are 90 degrees
Opposite sides of a cyclic quadrilateral Sum up to 180 degrees
Chords can be bisected By the line from the centre forming a perpendicular line
Tangents meet the radius At 90 degrees
Tangents from a common point to a circle Are equal
The angles between the tangent and the side of a triangle Are equal to the interior opposite angle
Created by: That cool NAMe
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