Answer:
1a) 2340
1b) 120°
Explanation:
1a) formula to find the sum of the interior angles is: (n-2) * 180
n = the number of sides
(15-2) * 180
(13) * 180 = 2340
2a) the formula to find the measure of one interior angle is:
![((n-2) * 180)/(n)](https://img.qammunity.org/2022/formulas/mathematics/high-school/mlkkf9ixrfnqszeruudyplsmd1gekksf10.png)
n = the number of sides
a hexagon has 6 sides
(6-2)*180
4 * 180 = 720
720 ÷ 6 = 120