平行線的條件 | Conditions for Parallel Lines
影片內容：
00:23 – 同位角相等 | corresponding angles equal
01:54 – 錯角相等 | alternate angles equal
03:04 – 同旁內角互補 | interior angles supplementary
05:28 – 例子 | example
00:23 – 同位角相等 | corresponding angles equal
01:54 – 錯角相等 | alternate angles equal
03:04 – 同旁內角互補 | interior angles supplementary
05:28 – 例子 | example