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How to use cosine rule to find unknown angles in non-right-angled triangles (with examples)
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Trigonometry can be applied to problem solving involving non-right-angled triangles.
The cosine rule for unknown angles is applied to such triangles where all three sides are known but all angles are unknown.
The cosine rule for unknown angles is just a rearranged form of the cosine rule for unknown sides, where the unknown angle is made the subject of the formula.
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