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Circle theorems
Circle theorem
Term | Definition |
---|---|
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 |