# angle at center is double the angle at circumference

- Author:
- Mathguru

- Topic:
- Angles

We can see a circle in black color. Its center is A and points B, C, D and E are present on its circumference. Angles CAB and CDE are drawn. Angle CDE=α and you can change its value using its slide bar. Move the points A, B, C and D and see how the size and position of the circle gets changed