Question

in the triangular pyramid shown below, which lines are intersecting? select all that apply.

Explanation:

Step1: Recall intersecting lines definition

Intersecting lines share a common point.

Step2: Analyze each pair

• For $\overleftrightarrow{RS}$ and $\overleftrightarrow{TU}$: They do not share a common - point in the pyramid.
• For $\overleftrightarrow{RT}$ and $\overleftrightarrow{SU}$: They do not share a common - point in the pyramid.
• For $\overleftrightarrow{RU}$ and $\overleftrightarrow{ST}$: They do not share a common - point in the pyramid.
• For $\overleftrightarrow{RT}$ and $\overleftrightarrow{ST}$: They share the common point $T$.

Answer:

$\overleftrightarrow{RT}$ and $\overleftrightarrow{ST}$