
Andy C. answered 08/23/17
Tutor
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Math/Physics Tutor
OPTION #1
You can use the law of cosines to find one of the angles.
Then use the law of sines to find a second angle.
Finally using the law of sines to find the third angle.
OPTION #2
You can use strictly the law of sines to get three equations
with three unknown angles. Much more challenging.
Option #3
You can drop a height from one of the vertices
and use the pythagorean theorem and trig.
Most challenging.