1. The problem asks for the sum of the interior angles of a polygon with seven sides, called a heptagon. 2. The formula to find the sum of interior angles of any polygon with $n$ sides is: $$\text{Sum of interior angles} = (n - 2) \times 180^\circ$$ 3. For a heptagon, $n = 7$. Substitute this into the formula: $$\text{Sum} = (7 - 2) \times 180^\circ = 5 \times 180^\circ$$ 4. Calculate the product: $$5 \times 180^\circ = 900^\circ$$ 5. Therefore, the sum of the interior angles of a heptagon is $900^\circ$. This means if you add up all the interior angles inside the seven-sided polygon, the total will be $900$ degrees.