A trapezium containing three right angles is split in two. What is the proportion of the areas yellow : blue?
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The three rights
Month: April 2021
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The fallen pine
Two congruent isosceles triangles and three lines. Prove triangle AEF is also isosceles.
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The color fan
Two congruent rectangles share a vertex. Given that the three coloured areas are equal, what is the width x?
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The right angle
Two triangles inside a quarter circle. What is their area proportion?
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The triangle quartet
A square is divided into four triangles. The red area equals the blue area. What is the angle α?
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The corner stone
Four squares inside another square. What fraction is yellow?
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The bigger picture
In a small square two perpendicular lines are drawn. A larger parallel square is constructed as shown. Prove it is a scaled copy of the smaller square but rotated 90° anticlockwise.
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La Flèche Wallonne
A triangle is divided in four. What is the black area?
A rectangle of height 2 is crossed by two line segments at right angles. What is its width?
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The navel orange
Two quarter circles and a semicircle inside a circle. What fraction of the circle is shaded by the semicircle?