Question

Find the measure of angle A in the following triangle https://static.k12.com/eli/bb/259/4_25245/2_17293_3_25248/8b7911af6ff4046b03fa260fbecdad8100849773/media/24e8a3fc18d4d615b2db04a4683bba3137e4a8b0/mediaasset_774319_1.gif

45.6 degrees

54.5 degrees

40.5 degrees

41.2 degrees

Answer 1

you need to use the *law of cosines * formula \[\huge\rm a^2 =c^2+b^2 -2bc \cos(A)\]

Answer 2

a is the opposite side of angle a