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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

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