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(a + b)° + 5a° = 180°
⇒ 6a + b = 180°
Perhatikan sudut yang dalam berseberangan
a + b = 65°
⇒ a = 65 - b
maka
6a + b = 180
⇒ 6(65 - b) + b = 180
⇒ 390 - 6b + b = 180
⇒ 5b = 210
⇒ b = 210/5
⇒ b = 42°
Terimakasih semoga membantu