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Does the question actually ask how many diagonal does a 4-sided polygon, 5 sided polygon, 6-sided polygon, until 10 have?

We will try.

4-sided polygon = 2 diagonals

5-sided polygon = 5 diagonals

6-sided polygon = 9 diagonals

7-sided polygon = 14 diagonals

8-sided polygon = 20 diagonals

9-sided polygon = 27 diagonals

10-sided polygon = 35 diagonals

We will try.

4-sided polygon = 2 diagonals

5-sided polygon = 5 diagonals

6-sided polygon = 9 diagonals

7-sided polygon = 14 diagonals

8-sided polygon = 20 diagonals

9-sided polygon = 27 diagonals

10-sided polygon = 35 diagonals