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ab+bc+cd+de = 180
2x +3x+y +62 = 180
2x+3x+y = 180 -62 (Persamaan satu linier) (positif (62) menjadi negatif (-62)
5x + y = 118
y = 118:5
y = 23,6 derajat
5x + 62 = 180
5x = 180 -62
5x = 118
x = 188/5
x = 23.6
jadi besar <COD adalah 23,6 derajat