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

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asked Sep 10, 2019 22.0k views

1 Answer

Dan Zawadzki · Answer 1 · 2019-09-14T20:30:32+0000

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

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

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