Question

which of the following means these lines are perpendicular? ab || xy ab = xy ab ⊥ xy

Explanation:

The symbol '⊥' is used to denote perpendicularity between two lines or line - segments. The symbol '∥' means parallel and '=' means equal in length.

Answer:

The third option $\overleftrightarrow{AB}\perp\overleftrightarrow{XY}$ means the lines are perpendicular.