A rectangle with three line segments. What is the proportion yellow : red?
A semicircle is inscribed in a rectangle. What is the minimal covered fraction?
Two congruent rectangles and squares. Proof that the four points are on one circle.
A rectangle is split by two perpendicular lines. The four circles pass through vertices and intersection points. Their centres form a purple quadrilateral. What fraction of the large rectangle area does it cover?
Two parallel lines support two rectangles. Prove they have equal area.
Two congruent rectangles are placed side by side. Two line segments form two coloured quadrilaterals and three triangles. What is the proportion purple : green?
Three rectangles and four triangles. Given that the red triangles have equal area, prove that the blue rectangles are similar.
A rectangle with a semicircle, a quarter circle and a common tangent. What fraction is blue?
An isosceles triangle, a rectangle and two diagonals. What is the proportion green : blue?
Four squares, a rectangle and a circle. What is the proportion brown : grey?