JAMB - Mathematics (2019 - No. 46)
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°
Vysvětlení
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°