Area of external triangle

Q. Calculates the area of external triangle

\[ 8R^2\times\cos\left(\frac{\angle A}{2}\right) \newline \times\cos\left(\frac{\angle B}{2}\right)\times\cos\left(\frac{\angle C}{2}\right) \]

Area of external triangle

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Reference

Information

  1. An exterior angle of a triangle is formed by any side of a triangle and the extension of its adjacent side..

    The area of external triangle is given by

    \[ 8R^2\times\cos\left(\frac{\angle A}{2}\right) \newline \times\cos\left(\frac{\angle B}{2}\right)\times\cos\left(\frac{\angle C}{2}\right) \]
How to use calculator

  1. Enter the three angles and the corresponding external radius. To use this calculator, you should be provided with three angles and a radius, r.

  2. Hit the check  done_outline   button to compute