Angles in Same Segment Flashcards

GCSE Mathematics (Edexcel) 1MA1

Angles in the same segment

Angles subtended by the same arc at the circumference of a circle are equal.

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Terms in this set (10)

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Angles in the same segment

Angles subtended by the same arc at the circumference of a circle are equal.

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Subtended angle

An angle formed at a point on the circumference by two lines drawn from the ends of the same arc.

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Arc

A part of the circumference of a circle.

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Key property of angles in the same segment

Angles subtended by the same arc on the circumference are always equal.

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Cyclic quadrilateral

A quadrilateral where all four vertices lie on the circumference of a circle.

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Angles in a cyclic quadrilateral

Opposite angles in a cyclic quadrilateral add up to 180°.

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Proof of angles in the same segment

This property is derived from the fact that the angle at the centre is twice the angle at the circumference.

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Angle at the centre vs angle at the circumference

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

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Chord

A straight line joining two points on the circumference of a circle.

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Practical use of angles in the same segment

This property is used to solve problems involving circle theorems and to find missing angles in diagrams.

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