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All the circle types Gr 8 - 10 - 25 Nov 2024 (Day before PT 2 Math)
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Angle at centre *2 angle at circumference.

Angles in same segment.

Opposite angles of cyclic quadrilateral. (Add up to 180)

Exterior angles of cyclic quadrilaterals are equal.

Equal chords subtend = angles.

Tangents from same point.

Tangent perpendicular radius.

Tangent chord theorem.

Line from centre is perpendicular to chord.

Angles at semicircle. (Equal to 90)

Midpoint chord theorem.