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jumlah sudut berpelurus = 180 derajt
maka :
a. 2x + x = 180
3x = 180
x = 180/3
x = 60
b. 40 +2x + 34 = 180
74 + 2x = 180
2x = 180-74
x = 106/2
x = 53
c. 30+2x+60 = 180
90 + 2x = 180
2x = 180-90
2x = 90
x = 45
d. aku kurang jelas :(