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3x + (4x + 5) = 180°
8x + 5 = 180
8x = 180 - 5
8x = 175
x = 21,875
maka, 3x = 65,625
∠BAC = 180 - (50 + 65,625)
∠BAC = 64,375 atau kira-kira 65°
3. 2x + 3x - 20 = 180
5x = 180 + 20
5x = 200
x = 200 : 5
x = 40
maka : 2x = 80°
∠QPR =180 - (80 + 40)
∠QPR = 60°