How to find the missing angle of a triangle using trig when you only know 1?

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If you have 2 KNOWN sides & 1 Angle ; Use Cosine Rule If you have 3 KNOWN sides, Also Cosine Rule If you have 2 KNOWN angles & 1 side, Use SINE rule If it's a right-angled triangle, use SOH CAH TOA Hopefully this helps

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