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Verified answer
A2 + B3 = 180° (Luar berseberangan)75° + B3 = 180°
B3 = 180°-75° = 105°
A2 = A4 (bertolak belakang)
A4 = 75°
A1 + A2 = 180° (1 garis lurus)
A1 + 75° = 180°
A1 = 105°
A1 = B1 (sehadap)
B1 = 105°
maaf kalau salah