As a rule,
the longest side is opposite to the largest angle . the second largest angle and the side opposite from it to find the next largest angle. and lastly, the shortest side is opposite to the smallest angle.
In this figure, the largest angle is 62 degrees and the opposite side is MN
Followed by 59 degrees which the opposite side is FM
Lastly, 54 degrees and the opposite side is NF
So the order from least to greatest is
NF < FM < MN