Help your students prepare for their Maths GCSE with this free circle theorems worksheet of 44 questions and answers
Circle theorems are a set of angle properties that apply within circles. We can use the circle theorems to work out missing angles.
To access circle theorems we need to be confident with the names of the key parts of a circle including the centre of the circle, the diameter of the circle, the radius of the circle, a tangent to the circle, a segment of the circle, a sector of the circle and a chord within the circle.
We also need to be confident at labelling angles using three letter notation. For example, angle BCD is the angle created at C when travelling from B to C to D. The centre of a circle is often labelled O, in which case the angle BOD would be the angle at the centre O when travelling from B to O to D.
The circle theorems are:
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