A semicircle is inscribed in a rectangle. What is the minimal covered fraction?
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The ocean sunset
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Triple dice
An equilateral triangle with three congruent squares. What’s the angle α?
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Paper hat II
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.
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The pentagon push
Two regular pentagons share a vertex. What’s the angle α?
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En garde
An isosceles triangle with two altitudes dividing each other in segments of length 4 and 5. What is the total triangle area?
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The satellite
A circle containing three squares. What fraction is coloured?
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Distant peaks
Two isosceles triangles and a right angle. What is the proportion green : gold?
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The blue pill
A regular octagon containing a blue hexagon. All line segments have equal length. What fraction is blue?
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The Lion King II
A regular hexagon and three squares. What is the proportion yellow : brown?