The sum of interior angles of a regular polygon is 1440 deg The number of sides of the polygon is ........

Quantitative Aptitude ( CCS) Geometry

The sum of interior angles of a regular polygon is 1440°. The number of sides of the polygon is

If the number of sides of a regular polygon be n. Then,
Sum of interior angles = 1440°
(2n – 4) × 90° = 1440°
2n – 4 = 16
2n = 20
n = 10

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