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angle at centre = 2 x angel at circumf

Angle in a semicircle
is 90 (angle in semi-circle)

Angles in the same segment
are equal

arc subtends equal angles
they are then concyclic

opp angles of cyc quad

ext angle of cyc quad

ext angle = opp int angel
converse of belongs in a circle

A radius perpendicular to a tangent

Tangents from the same point are the same length

angle between tangent and cord

angel between line and chord = angle in opp. segment
converse of theorem to prove a tangent
