Number of Tangents from a Point

Number of Tangents from a Point

For a point $$p$$ relative to a circle:

$$PC>r\Rightarrow\text{2 tangents}$$

$$PC=r\Rightarrow\text{1 tangent}$$

$$PC<r\Rightarrow\text{0 real tangents}$$

Usage

- Used to determine the number of real tangents that can be drawn from a point to a circle.