Trigonometry/Plane
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Plane trigonometry involves solving the mathematics of triangles. The law of sines and cosines are fundamental to this.
Law of sines[edit | edit source]
Area of a triangle[edit | edit source]
Law of cosines[edit | edit source]
- This law uses the Pythagorean theorem, but this includes non-right angles.
Heron's area formula[edit | edit source]
- s is the semi-perimeter