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B₂ = A₂ (Sehadap)
B₂ = 35°
B₃ = 180°-A₂ (Sudut luar sepihak)
B₃ = 180°-35°
B₃ = 145°
A₁ = 180°-A₂ (Berpelurus)
A₁ = 180°-35°
A₁ = 145°
=145
A3=145 (bertolak belakang)
A4=35 (ber tolak belakang)
B2, B3,... Sama dengan A
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