To calculate the total degree measure of the interior angles in a polygon, we can use the formula (n-2)*180 where 'n' represents the number of sides the shape has.
In this case, our shape has 9 sides, so we can substitute 'n' with '9'.
Let's start by subtracting 2 from the number of sides: 9 - 2 equals 7.
Then, multiply this result by 180: 7 * 180 equals 1260.
So, the total degree measure of the interior angles of a shape with 9 sides is 1260 degrees.