Two congruent equilateral triangles and two squares. What’s the angle α?
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Two congruent equilateral triangles and two squares. What’s the angle α?
A quarter circle, a semicircle and a triangle. What’s the angle α?
Two perpendicular lines and a third line. Four circles are tangent to all three lines. Prove that their areas satisfy AB=CD.
A quarter circle and a right triangle inside a square. One of the vertices of the triangle is the square’s centre. What fraction of the square’s area is green?
Three squares share four vertices. What is the proportion of the line segment lengths a and b?
A rectangle with three touching quarter circles. What fraction of its area is coloured?