Question

Find the sum of the interior angles of each of the following polygons.
(a) 11-gon
(b) 12-gon
(c) 15-gon
(d) 20-gon

please help me :(

and give step by step answer​

Answer 1

Step-by-step explanation

use (n-2)180 to  find sum of all interior angle of a polygon ,where n= no of sides

a)11-gon

=(11 - 2) 180= 1620 degree

b)12-gon

=( 12 - 2 ) 180 = 1800 degree

c)15-gon

=( 15 - 2 ) 180 = 2340 degree

d)20-gon

=( 20 - 2 ) 180 = 3240 degree

I gave direct answers , but first ,solve the bracket and multiply with 180 . The expression"(n-2)180", can be used to find any polygon's sum of interior angles.

Hope this helps you :)