sudut B1 = sudut A3
5x + 25° = 55°
5x = 55° - 25°
x = 30 : 5
x = 6
5x = 5×6 = 30°
Jawaban D
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sudut B1 = sudut A3
5x + 25° = 55°
5x = 55° - 25°
x = 30 : 5
x = 6
5x = 5×6 = 30°
Jawaban D