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untuk DEFGH, 3 sudut sama besar
jadi 3b = 180 derajat
b = 180/3 = 60 derajat
DEG = 2b = 2x60 = 120 derajat
untuk KLMN
4d + 60 + d = 180
5d = 120
d = 24
KLN = 4d + 60 = 4x24 + 60 = 156