A polygon with 7 sides is a heptagon.
Given:
number of sides = n = 7
The sum of interior angles in a polygon is given by;
[tex]\begin{gathered} \text{Sum}=(n-2)180 \\ \text{Sum}=(7-2)\times180 \\ \text{Sum}=5\times180 \\ \text{Sum}=900^0 \end{gathered}[/tex]
Therefore, the sum of the interior angles of a polygon with 7 sides is 900 degrees.
