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jadi, 360 ; 2 = 180, 180 - 40 x 2 :2 = 140 derajat
terimakasih
5x + x + 40 = 180
6x = 180 - 40
6x = 140
x = 23,3
jadi sudut F = 23,3
cek
5(23,3) + 23,3 + 40 = 179,8