# StudySquare

# Angles and circles

This page covers the following topics:

The angle subtended at the centre of a circle is twice the angle subtended at the circumference.

The angle at the circumference of a semicircle is 90°.

Angles in the same segment are equal.

The sum of opposite angles in a cyclic quadrilateral is 180°.

A tangent to a circle is always perpendicular to the radius of that circle.

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