The problem asks us to find the sum of the interior angles of a polygon with 13 sides.

1. Problem Description

The problem asks us to find the sum of the interior angles of a polygon with 13 sides.

2. Solution Steps

To find the sum of the interior angles of a polygon with $n$ sides, we use the formula:

$S = (n - 2) \times 180^{\circ}$

In this problem, the polygon has 13 sides, so $n = 13$.

Substituting $n = 13$ into the formula, we get:

$S = (13 - 2) \times 180^{\circ}$

$S = (11) \times 180^{\circ}$

$S = 1980^{\circ}$

3. Final Answer

The sum of the interior angles of a polygon with 13 sides is $1980^{\circ}$.