A square containing a red square of variable size sharing a vertex with a blue rectangle. What is the maximal blue fraction?
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The maxbox
Tag: area
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The motorcycle
Two congruent orange circles and a smaller blue one. Three common tangents are shown, one of which passes through a circle centre. What is the proportion blue : orange?
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Sharing is caring
Three equilateral triangles and three shared vertices. What’s the proportion blue : green?
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The fried egg
Two concentric circles and two tangents. What is the yellow fraction?
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The piercing
An equilateral triangle containing a right triangle and a line segment. What fraction is pink?
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The crazy quilt
A parallelogram is divided into several areas. What is the area X of the blue trapezium?
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The bell tolls
An equilateral triangle inscribed in a rectangle. What is its area X in terms of triangle areas A and B?
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The Pisa experiment
Four squares and an altitude to the top vertex form a right yellow traingle. What is the proportion yellow : green?
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The parrot
Two squares, a diagonal and a line segment. What is red : blue : green?
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Boxed in
A square with an inscribed right triangle. What fraction is yellow?