What is the angle at the centre theorem?

The angle subtended by an arc at the centre is twice the angle subtended by the same arc at any point on the remaining part of the circle.

What is a cyclic quadrilateral?

A quadrilateral whose four vertices lie on the same circle is called a cyclic quadrilateral.

Learn each theorem with its diagram, identify the relevant angles or chords, and give reasons in proof questions.

ICSE MathematicsClass 10Chapter 17

Chapter 17

Study circle theorems, angles and properties required for ICSE Class 10 geometry and examination problems.

TOPICS

Angles in a circleCyclic quadrilateralsChord propertiesArc and angle relationshipsCircle theorems

CHAPTER RESOURCES

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IMPORTANT QUESTIONSExam Prep

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PRACTICE WORKSHEETExercises

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