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10x = 180
x = 180/10
x = 18
Sudut A :
3x + 30
3(18) + 30
54 + 30 = 84 derajat.
Sudut B :
2x - 20
2(18) - 20
36 - 20 = 16 derajat.
Sudut C :
5x - 10
5(18) - 10
90 - 10 = 80 derajat.
Segitiga lancip karena ketiga sudutnya kurang dari 90 derajat.
Semoga membantu.