Circle theorems

11 topics

1. Checking and securing understanding of the parts of a circle
2. The angle at the centre of the circle is twice the angle at any point on the circumference
3. The angle in a semicircle is a right angle
4. The perpendicular from the centre of a circle to a chord bisects the chord
5. The tangent at any point on a circle is perpendicular to the radius at that point
6. The angles in the same segment are equal
7. The alternate segment theorem
8. The opposite angles of a cyclic quadrilateral sum to 180°
9. The tangents from an external point are equal in length
10. Identifying which circle theorem to use
11. Problem solving with circle theorems

License: OGL