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jwbn:1 dgn 1 2 dgn 2 3 dgn 3 4 dgn 4
6b.sepihak luar = sudut A1 dgn D4 dan B2 atau C3 dgn B2 dan D4
sepihak dalam = sudut D2 dgn A3 C1 dgn A4
6c. berseberangan = tolak belakang = A2dgnA4 dll
semoga membantu