Question

what is the number of sides of a regular polygon with the sum of angles as : 1620degrees

Answer 1

the sum of the measure of the interior angles is (n - 2) * 180=1620
n-2=1620/180
n-2=9
n=11

11 sided polygon

Answer 2

sum of angles of a regular polygon with 'n' sides is given by the formula (n - 2)x180
therefore
(n - 2)x180=1620
=>n - 2=1620/180
therefore n =11
the number of sides of a regular polygon with the sum of angles as : 1620°=11 sides.
for 2520°

(n-2)x180=2520
n-2=2520/180
n=21
the number of sides of a regular polygon with the sum of angles as :2520°=21

I hope this will help you