# The angle at the centre is twice the angle at the cirmfrnc

- Author:
- Mokhulu Lawrence Matshika

- Topic:
- Angles

Use the applet to verify the theorem stating that "The angle subtended by an arc at the centre of a circle is double the size of the angle subtended by the same arc at the circle circumference (on the same side of the arc/chord as the centre)". You can vary the angle by moving either point B or D.