1. The problem asks for the sum of the interior angle measures of a heptagon. 2. A heptagon is a polygon with 7 sides. 3. The formula to find the sum of interior angles of any polygon with $n$ sides is: $$\text{Sum of interior angles} = (n - 2) \times 180^\circ$$ 4. For a heptagon, substitute $n = 7$: $$\text{Sum} = (7 - 2) \times 180^\circ$$ 5. Simplify inside the parentheses: $$\text{Sum} = 5 \times 180^\circ$$ 6. Multiply: $$\text{Sum} = 900^\circ$$ 7. Therefore, the sum of the interior angle measures in a heptagon is $900^\circ$.