Each of the interior angles of a regular polygon is 140°. Calculate the sum of all the interior angles of the polygon.
- 1080°
-
1260°
- 2160°
- 1800°
The correct answer is: B
Explanation
Since each interior angle = 140°;
Each exterior angle = 180° - 140° = 40°
Number of sides of the polygon = \(\frac{360°}{40°}\)
= 9
Sum of angles in the polygon = 140° x 9
= 1260°
There is an explanation video available .