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180= 3x+2x+40
180-40=3x+2x
140=5x
x=140÷5
x=28
jadi
2x=2 × 28 =56'
3x=3 × 28 =84'
5x = 180° - 40°
5x = 140°
x = 28°
Sudut A = 2x = 2 x 28° = 56°
Sudut C = 3x = 3 x 28° = 84°