Each of the interior angles of a regular polygon is 140°. Calculate the sum of all the interior angles of the polygon.
-
A.
1080° -
B.
1260° -
C.
2160° -
D.
1800°
Correct Answer: Option 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 below.