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a6 = 41°
b10 = 107.5°
A3 + B9 = 180
2x - 4 + 3x -1 = 180
5x = 185
x = 185/5 = 37
A3 = 2x - 4 = 2.37 - 4 =74 - 4 = 70
B9 = 3x -1= 3.37 - 1 = 111 - 1 = 110
A3 + A5 + A4 = 180
70 + A5 + 90 = 180
A5 = 180 - 160 = 20
A6 = A3 = 70 ( sudut yang bertolak belakang)
B10 + B9 = 180
B10 + 110 = 180
B10 = 180 - 110 = 70