Question

in the cube shown below, which lines are intersecting? bf and de cd and de cg and ei hi and de

Explanation:

Step1: Recall intersecting lines definition

Intersecting lines share a common point.

Step2: Analyze each option

• For $\overrightarrow{BF}$ and $\overrightarrow{DE}$, they are skew - no common point.
• For $\overrightarrow{CD}$ and $\overrightarrow{DE}$, they share the common point $D$.
• For $\overrightarrow{CG}$ and $\overrightarrow{EI}$, they are skew - no common point.
• For $\overrightarrow{HI}$ and $\overrightarrow{DE}$, they are parallel - no common point.

Answer:

$\overrightarrow{CD}$ and $\overrightarrow{DE}$