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Verified answer
➡Sudut Garis lurus = 180°Maka :
5a +65° = 180°
5a = 180° - 65°
5a = 115°
a = 115/5
a = 23°
Maka :
(a + b) + 5a = 180
6a + b = 180
6(23°) + b = 180
138 + b = 180
b = 180 - 138
b = 42° ➡Opsi C