Question

in the cube shown below, which lines are intersecting?

Explanation:

Step1: Recall intersecting - lines definition

Intersecting lines meet at a point.

Step2: Analyze each option

• For $\overleftrightarrow{BC}$ and $\overleftrightarrow{FG}$, they are parallel, don't intersect.
• For $\overleftrightarrow{CD}$ and $\overleftrightarrow{CG}$, they meet at point $C$, so they are intersecting.
• For $\overleftrightarrow{DH}$ and $\overleftrightarrow{FI}$, they are skew - lines, don't intersect.
• For $\overleftrightarrow{HI}$ and $\overleftrightarrow{CD}$, they are skew - lines, don't intersect.

Answer:

$\overleftrightarrow{CD}$ and $\overleftrightarrow{CG}$