A quarter circle and a square. What’s the angle α?
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Sliding down II
Category: Beginner
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Crossing mountains
A rectangle with four line segments. What’s brown : blue?
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Diamond life
Two equilateral triangles and one centre. What’s green : red?
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The dirty thirties
A triangle containing a semicircle and a circular sector centred in the right vertex. What is blue : green?
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Family ties
Two regular pentagons share a vertex. What is the proportion red : green?
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Longing for spring
Four semicircles and three line segments. What’s the proportion yellow : orange?
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The double bottom
A regular hexagon and a square share a vertex. What is the area proportion square : hexagon?
A square contains a yellow right triangle with an area of 11. What is the square’s area?
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Almost sunk
A square contains a right triangle. What fraction is red?
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Going halfway
A regular hexagon contains a diagonal, a green equilateral triangle and a red triangle. Prove that the latter is isosceles.