Question

In the fig, $\overleftrightarrow{AB}$ is ___ to $\overleftrightarrow{PQ}$.

Answer 1

$\overleftrightarrow{PQ}$ intersects $\overleftrightarrow{AB}$ and forms a ${90}^{\circ }$.
Therefore, $\overleftrightarrow{PQ}\perp \overleftrightarrow{AB}$.