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2x + 62 = 180
2x = 180 - 62
2x = 118
x = 118 : 2
x = 59°
8. 7x + 5x = 180
12x = 180
x = 180 : 12
x = 15
salah satu sudutnya adalah = 5x = 5(15) = 75°
9. 2/7x + x = 180
9/7x = 180
x = 180(7/9)
x = 140
jadi, sudut itu adalah = 2/7(140) = 40°
10. 3x + 2x + 90 = 180
5x = 180 - 90
5x = 90
x = 90 : 5
x = 18
Jadi, ∠PQS = 3(18) = 54°