Systerms : system terms : 同旁内角

A (41) | B (23) | C (62) | D (45) | E (33) | F (34) | G (18) | H (16) | I (28) | J (2) | K (5) | L (14) | M (29) | N (17) | O (10) | P (62) | Q (10) | R (41) | S (74) | T (31) | U (12) | V (12) | W (8) | X (1) | Y (2) | Z (2)

两条直线被第三条直线所截，在截线同旁且在被截线之内的两角，叫做‌同旁内角‌。当两直线平行时，同旁内角‌互补（和为 180°）‌，反之若同旁内角互补，则两直线平行。‌‌

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