A circle within an equilateral triangle within a circle. What fraction is shaded?
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The tumbler doll
Category: Beginner
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The green kimono
An equilateral triangle and three squares. What’s the angle?
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The circus tent
A regular octagon is coloured as shown. What fraction of its area is red?
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The windshield wipers
A square and two rectangles, connected by two circular arcs, form a square. What is the proportion of the orange to the green area?
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The square peg
A square is fitted into an equilateral triangle as shown. What fraction is shaded?
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The velocipede
Two circles are embedded in a frame of size 9 x 8. What is their total area?
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The askew envelope
In a square, an interior point is drawn with an angle to the top vertices of 120°. What’s the angle between the chords formed by the two arcs centered in these vertices?
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The fishing net
Two squares and two equilateral triangles. What fraction is hatched?
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The broken window
A square is divided into triangles and quadrilaterals as shown. What fraction of the square area is covered by the shaded triangle?
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The diagonal dilemma
On two faces of a cube a diagonal is drawn that meet in the same vertex. What’s the angle between them?