Answer
5 diagonals
Work Step by Step
D=$\frac{n(n-3)}{2}$
D=$\frac{5(5-3)}{2}$
D=5
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.