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4x + 5x = 180°
9x = 180°
x = 180 ÷ 9 = 20° (B)
25.
x + 35 + 2x - 5 = 180°
3x + 30 = 180°
3x = 180 - 30
3x = 150
x = 150 ÷ 3 = 50°
sudut Q4 = 2x - 5 =
2(50) - 5 = 100 - 5 = 95° (D)