How do you solve a triangle given <A=84.2°, <B=20.7°, B=17.2?
The following diagram represents your problem
Since we know an angle opposite a known side, we can use the Sine Rule to solve for side a.
We could have done this at first, but let's find angle C. We know that the sum of the three angles in a triangle always equals 180. Therefore, we can set up the following equation:
We must now substitute the value of angle C to find side C.
Your triangle has the following dimensions:
Hopefully this helps!