If the interior angle of a regular polygon is double the exterior angle, then the polygon has ______ sides.
6
It is given that the polygon is regular.
Let exterior angle = e°
Interior angle = 2e° (given)
In a regular polygon,
interior angle + exterior angle = 180°
2e + e = 180°
3e = 180°
e = 60°
Number of sides (n) = 360°exterior angle
= 360°60°
= 6