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7x + 40 = 180
7x = 140
x = 20
4x + 30 = (4 x 20) + 30 = 110 derajat
Sudut BFG = Sudut DEF = 4x + 30°
Sudut AFG + Sudut BFG = 180°
3x + 10° + 4x + 30° + 180°
7x + 40° = 180°
7x = 180° - 40° = 140°
x = 140° : 7 = 20°
Sudut BFG = 4x + 30°
= 4 x 20° + 30°
= 80° + 30°
=110°