The text in the image states that the lines $\overleftrightarrow{AB}$ and $\overleftrightarrow{CD}$ are parallel ($AB \parallel CD$) and asks about their relationship in various figures. To assist further, I need more context or additional figures from the problem since the question refers to specific diagrams or shapes ("الأشكال التالية"). Could you upload the complete problem or related shapes to ensure accurate assistance?