Circles, Part 2: Tangents from an external point
Two tangents, one point, and a surprising equality.
In this lesson you will
- Prove that the two tangents from an external point are equal
- Use the angle facts: OP bisects the angles and the angle between the tangents is supplementary to the angle at the centre
- Solve problems on quadrilaterals and triangles drawn round a circle
- Combine both theorems in multi-step problems