Martin McBride, 2020-08-16

Tags circle chord angle

Categories maths gcse geometry

For any chord, we can draw two lines to form an angle at the centre of the circle, angle **a**.

We can also draw two lines to form an angle at the circumference, **b**.

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

This theorem is covered in this video on circle theorems:

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