Misalkan :
Maka, berpelurus :
8x + x = 180°
9x = 180°
x = 180° ÷ 9
x = 20° ← Sudut kedua
__
8x
= 8(20)
= 160° ← Sudut pertama
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Misalkan :
Maka, berpelurus :
8x + x = 180°
9x = 180°
x = 180° ÷ 9
x = 20° ← Sudut kedua
__
8x
= 8(20)
= 160° ← Sudut pertama
Jawaban : B.