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Circles (Properties (Angle properties (Angle at centre is twice angle at…
Circles
Properties
Angle properties
Angle at centre is twice angle at circumference
Right angle in semicircle
Angles in same segment are equal
Angles in opposite segments are supplementary
Chord Properties
Perpendicular bisector of chord
Perpendicular from centre bisects chord
Equal chords are equidistant from centre
Tangent properties
Tangent is perpendicular to radius
Tangents from external point
.
Lengths
Circumference
Radius
Diameter
Arc Lengths
Chords
Areas
Trigonometry
Area of triangle = 1/2 a b sin C
Area of triangle = 1/2 base height
Sine rule, Cosine rule, Pythagoras' Theorem
Radian measure /
Degrees / Pi / Ratios
Sectors
Minor
Major
Segments
Minor
Major