Plane trigonometry involves solving the mathematics of triangles. The law of sines and cosines are fundamental to this.


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- This law uses the Pythagorean theorem, but this includes non-right angles.


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- s is the semi-perimeter

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[2]
- ↑ Trigonometry (7th ed.), Addison Wesley, 2001, 0-321-05759-7
- ↑ "Trigonometry". Britannica 28: 619. (1993). University of Chicago. 0-85229-571-5.