Two squares sharing a vertex and a line segment. What’s the yellow area?
A walk in the park

Two squares sharing a vertex and a line segment. What’s the yellow area?
Three squares and a circle. The red point is a common intersection of two square sides and the circle. What is blue : green?
Two blue squares and two red right triangles. What are the proportions of the triangle sides?
Author: Matthew Arcus.
Two squares share a vertex. What’s blue : green : orange?
Two squares and two line segments. If the angle α is maximal, what is yellow : red?
A square and two congruent circles with three common tangents. What’s yellow : red?
A square containing three smaller squares and a quarter circle. What fraction is orange?
Three squares and two perpendicular line segments. What is red : yellow : blue?
A regular hexagon and two squares. What’s the angle α?
Two squares sharing a vertex, a diagonal and a line segment. Prove that the two angles are congruent.