Answer
$\longleftrightarrow$
$CD$
Work Step by Step
The figure is a line because it has an arrows on both ends.
It is named line CD because the labeled points are C and D.
$\longleftrightarrow$
$CD$
You can help us out by revising, improving and updating this answer.
Update this answerAfter you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.