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Circle theorems

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AS - Level Maths Flashcards on Circle theorems , created by Hannah Whitehead on 11/01/2015.
Hannah Whitehead
Flashcards by Hannah Whitehead, updated more than 1 year ago
Hannah Whitehead
Created by Hannah Whitehead over 10 years ago
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Question Answer
The perpendicular bisector of any chord passes through the centre of the circle.
The angle in a semicircle is always 90*.
The radius and a tangent always meet at 90*.
Angles in the same segment are equal.
The angle at the centre is twice the angle at the circumference.
Opposite angles of a cyclic quadrilateral add up to 180*. (A cyclic quadrilateral is a four-sided shape with each corner touching the circumference of the circle).
The lengths of two tangents from a point are equal.
Alternate segment theorem.
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