Question

How to solve this trig triangle

Answer 1

Use the law of cosines:

c2=a2+b2−2ab cosC
The law of cosines is used in SSS and SAS triangles, and the law of sines in ASA, and the ambiguous case of SSA (which you have to solve two triangles).

Answer 2

Explanation:

First you need to find the semi perimeter (s) and apply the formula of the triangle and you will get your answer