Every other side of a regular decagon is extended to form a regular pentagon, find the ratio of two shaded regions?
In the regular decagon (10-sided polygon) below, find the percentage of the shaded area.
A five pointed star is made by extending sides of a regular pentagon. What fraction of star on right is shaded yellow?
A regular hexagon with side length 2 has semicircles constructed in its interior of each side. What is the shaded area inside the hexagon not covered by the semicircles?
The area of the small regular pentagon is A. The area of the big regular pentagon is B. What is A/B?
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.
