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2 = 70 derajat
1 = 100 derajat
soal 38
1 = 70 derajat
2 = 110 derajat
soal 39
90 + x + 2x = 180
90 + 3x = 180
3x = 90
x = 30 derajat
soal 40
30 + 90 + x = 180
120 + x = 180
x = 60 derajat