Length of Tangent from a Point to a Sphere

Rarely Tested

Length of Tangent from a Point to a Sphere

For a sphere with centre $$c$$ and radius $$r$$, if point $$p$$ is outside the sphere:

$$PT=\sqrt{PC^2-r^2}$$

Usage

- Used to find the length of a tangent drawn from an external point to a sphere.

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