Two semicircles inside a rectangle. What is the proportion of the red to the green area?
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An Italian hill
Month: December 2020
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Domino day
Three congruent rectangles consisting of two squares each are placed as shown. What is the blue area?
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The carambole
Three touching congruent circles inscribed in an equilateral triangle. A small equilateral triangle inscribed in the centre space. What fraction is blue?
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The eye of the beholder
A square and two equilateral triangles inside and touching a circle. What’s the angle?
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The star of Bethlehem
Two concentric equilateral triangles with parallel sides. What fraction is orange?
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The christmas tree
A triangle, a median and another cevian. What is the proportion of the two areas?
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The bowtie
A square and two congruent isosceles triangles with variable top angle. What is the maximum fraction shaded?
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The inner triangle
A triangle and two medians. What fraction is shaded?
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The ace of diamonds
Four congruent right triangles form a rectangle. What fraction is red?
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The tip of the iceberg
A triangle with a 45° angle is placed inside a square as shown. What’s the area proportion of parts A and B?