Each of the interior angles of a regular polygo... - JAMB Mathematics 2019 Question
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 option: b
Given that each interior angle = 140°,
each exterior angle = 180° - 140° = 40°
Number of sides of the polygon = \(\frac{360°}{40°}\) = 9
Sum of the angles in the polygon = 140° x 9
= 1260°
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