All you need to do is match the sides with the sides and angles with the angles. You see where the thing has the letters with equal sign. That’s what sides correspond with Escher and with that get the corresponding angles
you can reason this concretely. suppose you start with 60 bugs. 1/5 of the 60 bugs is 12 bugs divide 12 bugs into 3 equal groups. each group has 12/3 = 4 bugs. the fraction now is 4/60 in lowest terms this is 1/15