Two congruent rectangles support a third rectangle. What fraction is blue?
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The hanging door
Tag: area
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The PowerPoint
A point lies 8 from the centre of a circle of radius 6. The angle α is variable. What’s the maximum triangle area?
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The kids windmill
Six congruent equilateral triangles placed inside a regular hexagon. What fraction is coloured?
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Tall and wide
An equilateral triangle inscribed in a square. What’s the proportion of the red to the blue area?
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Who’s afraid of red, yellow and blue?
Three squares. The top line segment is variable in length. What’s the minimal blue fraction?
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The balance sheet
A unit square and a parallelogram. What’s the area of the latter?
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Mondriaan in maths
Two squares with areas of 1 and 3 are inscribed in a square frame. What’s the angle?
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The butterfly effect
Two touching circles and two lines passing through the tangency point. What is the area proportion of the two triangles?
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The paper hat
A rectangle and several triangles. The orange triangle has the same area as the green trapezium. What’s the total coloured fraction?
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A winter valley
A rectangle and two triangles. What’s the total area?