Distance Between Diametrically Opposite Points

Distance Between Diametrically Opposite Points

For:

$$P(a\cos\theta,b\sin\theta)$$

and its opposite point:

$$P'(-a\cos\theta,-b\sin\theta)$$

the diameter length is:

$$PP'=2\sqrt{a^2\cos^2\theta+b^2\sin^2\theta}$$

Usage

- Used to find the length of a diameter in a specified direction.

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