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P2 = 180 - 80 = 100
P4=P2 = 100 (krn bertolak belakang)
P2=Q3=100 (krn dalam bersebrangan)
Q3=Q1=100 (bertolak belakang)
Q4=180-100 = 80
Q4=Q2=80 (bertolak belakang)
semoga membantu!;)