A regular octagon of side length 2 with two diagonals and a square. What is the purple area?
A regular octagon with two diagonals and two squares. What’s the area proportion of the blue to the red square?
Four isosceles triangles of base 1 and four of base √2 share their top vertex. What is the proportion brown : gold?
A regular octagon containing a blue hexagon. All line segments have equal length. What fraction is blue?
A regular octagon is coloured as shown. What fraction of its area is red?