➷ Use this formula:
Sum of interior angles = (n - 2) x 180
'n' is the number of sides
Substitute in the value:
Sum of interior angles = (22 - 2) x 180
Solve:
Sum of interior angles = 3600
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Answer:
3600 degrees.
Step-by-step explanation:
The average measure of the exterior angles = 360 / 22 = 16.3636
So each interior angle has average measure 180 - 16.3636
= 163.6364 degrees.
The sum of the interior angles = 163.6364 * 22
= 3600 degrees