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By Trigonometry.

There are two Rules.

Sine Rule ; SinA/a = SinB / b = SinC/c

For this rule you need either two angles and one side, or two sides and one angle.

Cosine Rule ; a^(2) = b^(2) + c^(2) - 2bcCosA

This can be rearranged to

CosA = (a^(2) - b^(2) - c^(2)) / (-2bc)

For this rule you need three sides only, in order to calculate an angle.

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lenpollock

Lvl 16
3mo ago

What else can I help you with?