Circle Theorem 3
- Author:
- Mr E. Bissoon
- Topic:
- Circle
Theorem 3
The angle in a semi-circle is a right angle.
In plain terms:
The angle at the centre - in this case the diameter - is
Just as in Circle Theorem 2, the angle at the centre is twice that as at the circumference. So, if the angle at the centre is then the angle at any point on the circumference will be half of that: