Question

which shows \overleftrightarrow{gh} \perp \overleftrightarrow{ij}?

Explanation:

Step1: Recall Perpendicular Definition

Perpendicular lines (\( \perp \)) intersect at \( 90^\circ \) (right angle).

Step2: Analyze Diagrams

• Left diagram: Lines \( \overleftrightarrow{GH} \) and \( \overleftrightarrow{IJ} \) intersect at a right angle (visually form L - shape, \( 90^\circ \) intersection).
• Right diagram: Lines intersect at an angle that is not \( 90^\circ \) (obtuse or acute, not a right angle).

Answer:

The left diagram (with \( G, H \) on the vertical - like line and \( I, J \) on the line crossing at \( 90^\circ \)) shows \( \overleftrightarrow{GH} \perp \overleftrightarrow{IJ} \).