What is 11 fraction 1/3 divided by 2 fraction 5/6

My understanding of your question is taken as a mixed fraction is this 11 1/3  divided by 2 5/6 . If this is correct you can simply turn  them first to improper fraction which goes: 34/3  divided by  17/6 then multiply the second number in reciprocals. Thus, 34/3  X  6/17 = 4 in its simplest form. Hope this helps!

Angle C because it is opposite the longest side.