| Angle
at centre twice angle at circumference
Angle in alternate segment
Converse of angle in alternate segment
Angle in same segment
Converse of angle in the same segment
Angle in semi-circle
Chords equidistant from centre are equal
Equal chords, equidistant from centre
Exterior angle equals interior opposite
angle
Exterior angle, cyclic quadrilateral
Opposite angles supplementary
Opposite angles, cyclic quadrilateral
Line from centre perpendicular to chord
bisects chord
Line joining centre to mid-point of chord
perpendicular to chord
Tangent properties
Tangent perpendicular to radius
Converse of tangent perpendicular to
radius
Circumcircle (construction)
Perpendicular bisector (construction)
Tangent from external point (construction)
Perpendicular line at one end point of a
line segment (construction) |
