If the sum of interior angles of a regular polygon is equal to two times the sum of exterior angles ...........

Quantitative Aptitude ( CCS) Geometry

If the sum of interior angles of a regular polygon is equal to two times the sum of exterior angles of that polygon, then the number of sides of that polygon is

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Explanation:

Let the number of sides of a regular polygon is n. Then,
Sum of interior angles = (2n – 4) × 90°
Sum of exterior angles = 360°
∴ (2n – 4) × 90° = 2 × 360°
2n – 4 = 8
2n = 12
n = 6