180°-45°:135°-90°:45°
180°-30°:150°-90°:60°
45 + 60 : 105
180°-105°=75°
jawaban : C.75°
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180°-45°:135°-90°:45°
180°-30°:150°-90°:60°
45 + 60 : 105
180°-105°=75°
jawaban : C.75°