Question

The difference between the interior and exterior angles at a vertex of a regular polygon is 120. The number of sides of the polygon is : 11 13 12 14

Answer 1

Answer:

I=interior angle

E=Extrangle

I +E=l80

I-E=120

on adding

2 I=300

I=150

soE=30

No. of sides = 360/I extriangle

= 360 / 30=12

No. of SIDES = 12

I