Correct Answer - Option 1 : 60°

**Given**

The ratio between the interior angle and the exterior angle of a regular polygon is 2 : 1

**Concept**

Exterior angle + interior angle = 180°

Side of polygon = (360°/Exterior angle)

**Calculation**

Let ratio of angles in x

⇒ The ratio between the interior angle and the exterior angle of a regular polygon is = 2x : x

⇒ 2x + x = 180°

⇒ 3x = 180°

⇒ x = (180°/3)

⇒ x = 60°

⇒ Each interior angle = 120°

⇒ Each exterior angle = 60°

**∴ Each exterior angle = 60°**