The Sine Law:
Figure 1
When you know 1 side of triangle and its 2 angles and you must find another side, you can use this law. It also works, when you know 2 sides and 1 angle and you need to define another angle.
From triangle ABC (Figure 1) we can write that
.
The Cosine Law:
When you know 2 sides of triangle ABC and one of its angles, you can find the third side using the next formula:
or
or
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