Question

in the cube shown below, which lines are intersecting?
st and mp nr and qt nr and rs nr and st

Explanation:

Step1: Recall intersecting lines definition

Intersecting lines share a common point.

Step2: Analyze $\overleftrightarrow{ST}$ and $\overleftrightarrow{MP}$

They are skew - no common point.

Step3: Analyze $\overleftrightarrow{NR}$ and $\overleftrightarrow{QT}$

They are skew - no common point.

Step4: Analyze $\overleftrightarrow{NR}$ and $\overleftrightarrow{RS}$

They meet at point R.

Step5: Analyze $\overleftrightarrow{NR}$ and $\overleftrightarrow{ST}$

They are skew - no common point.

Answer:

$\overleftrightarrow{NR}$ and $\overleftrightarrow{RS}$