Answer:
Octagon:
Sum = 1080
One interior angle = 135
14-gon:
Sum = 2160
One interior angle = 154.286
20-gon:
Sum = 3240
One interior angle = 162
Step-by-step explanation:
Sum of angles in a polygon -> sum of angles = (n – 2)180°
one interior angle = sum of angles/n
n = number of sides
one interior angle = sum of angles/n
Octagon:
Sum = 1080
One interior angle = 135
14-gon:
Sum = 2160
One interior angle = 154.286
20-gon:
Sum = 3240
One interior angle = 162
