The ratio between the exterior angle and the interior angle of a regular polygon is 2 : 3 . Find the number of sides of the polygon.
A twelve pointed star is made by extending the sides of a regular 12-sided polygon (a dodecagon). What is the measure of the grey angle?
In the regular decagon (10-sided polygon) below, find the percentage of the shaded area.
A hexagon has interior angles in arithmetic progression where difference of angles is double the smallest angle. What is the measure of largest interior angle of this hexagon?
