Question

Find the measure of an interior angle of a regular polygon of 9

sides​

Answer 1

Answer

interior angle of regular polygon =180×no.of triangle in polygon.

Note: No. of triangle in a polygon is alway -2 of that side.

Example : 9 side of polygon.

to find no. of triangle in this polygon is so, 9-2=7

come to the points :

angle =180×7

=1260 degree

one side =1260÷9

Answer=140 degree