Circles, Part 1: Tangents and the radius
A line can miss a circle, cut it twice, or just touch it once.
In this lesson you will
- Tell a secant from a tangent and a line that misses the circle
- State how many tangents pass through a point inside, on and outside a circle
- Prove that the tangent at a point is perpendicular to the radius
- Use the right angle at the point of contact to find lengths and angles