A right triangle with a red and yellow square attached. Two circular arcs centered in the triangle vertices. What is the area of the orange rectangle in terms of red and yellow?
An equilateral triangle containing a parallelogram, another equilateral triangle and a circular arc that is tangent in its base vertices. What is the proportion pink : blue?
A unit square with an extended side immersed in another square. What is the area of the red triangle?
Four squares, three of which are coloured. What’s the area of the blue one?
Two regular pentagons are placed side by side. What’s the proportion blue : green?
Divide a rectangular piece of paper in five pieces of equal area. You only have a pair of scissors at your disposal, but you are allowed to make straight folds to guide you.
A square and a rectangle share a vertex. Two triangle areas are given. What is the total area?
A square containing an isosceles triangle with given side lengths. What fraction is red?
A square containing four smaller squares. What fraction of its area is orange?
A square divided by three line segments. The red and blue areas are equal. What’s the length proportion a : b?