maths test 3 or 4 revusion

The angle in a semi Circle is at a right angle

A Radius meets a tangent at 90

The angle at the centre is twice the angle at the circumference

Angles in the same segment are equal

Opposite angles of a cyclic quadrilateral sum up to 180

Tangents to a point are of equal length

The line from the centre of the circle meets a chord and bisects it at right angles

The angle between a chord and tangent equals the angle in the alternate segment