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dalam bersebrangan 4, 2
(i) sudut P4 = sudut Q3
sudut P3 = sudut Q2
sudut P1 = sudut Q4
sudut P2 = sudut Q1
(ii). sudut P3 = sudut Q4
sudut P2 = sudut Q3
(iii). sudut P4 = sudut Q1
sudut P1 = sudut Q2
(iv). sudut P3 + sudut Q3 = 180°
sudut P2 + sudut Q4 = 180°
(v). sudut P4 + sudut Q2 = 180°
sudut P1 + sudut Q1 = 180°