A semicircle is inscribed in a rectangle. What is the minimal covered fraction?
An equilateral triangle with three congruent squares. What’s the angle α?
Two overlapping congruent right triangles. If |AB|=15 and |BC|=7, what is the total area?
Two congruent rectangles and squares. Proof that the four points are on one circle.
Two regular pentagons share a vertex. What’s the angle α?
An isosceles triangle with two altitudes dividing each other in segments of length 4 and 5. What is the total triangle area?
A circle containing three squares. What fraction is coloured?
Two isosceles triangles and a right angle. What is the proportion green : gold?
A regular octagon containing a blue hexagon. All line segments have equal length. What fraction is blue?
A regular hexagon and three squares. What is the proportion yellow : brown?