i have one quick question...
a problem gives us that:
A= 60 degrees, a=9, c = 10...
my only concern is that if the remaining two angles are also 60...
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you can't just assume that. you can assume though that the other two angles will add up to 120 degrees though.
Use Law of Sines:
We need the angle, so we use inverse Sin ( ).
The other angle is approximately
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