Answer: Therefore, the correct interior angle sum for a 13-sided figure is 1980 degrees, not 2340 degrees as calculated by Terrell. This shows that Terrell's calculation is incorrect.
Step-by-step explanation:
Terrell's calculation is not correct. To determine the interior angle sum of a polygon, you can use the formula:
Interior angle sum = (n - 2) * 180 degrees
where n is the number of sides in the polygon.
In this case, Terrell has a 13-sided figure. So, applying the formula:
Interior angle sum = (13 - 2) * 180 degrees
Interior angle sum = 11 * 180 degrees
Interior angle sum = 1980 degrees
Therefore, the correct interior angle sum for a 13-sided figure is 1980 degrees, not 2340 degrees as calculated by Terrell. This shows that Terrell's calculation is incorrect.
