A triangle, a median and another cevian. What is the proportion of the two areas?
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The christmas tree
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The bowtie
A square and two congruent isosceles triangles with variable top angle. What is the maximum fraction shaded?
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The inner triangle
A triangle and two medians. What fraction is shaded?
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The ace of diamonds
Four congruent right triangles form a rectangle. What fraction is red?
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The tip of the iceberg
A triangle with a 45° angle is placed inside a square as shown. What’s the area proportion of parts A and B?
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The hunting horn
Two semicircles and four tangents. What’s the area of the orange rectangle?
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The rubber rotation
Two overlapping rectangles. What is the proportion of their areas? All triangles in the diagram are right.
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The radio telescope
A square contains two triangles. What fraction of the square do they cover?
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The Post-it note
Two unit squares (having side 1) are placed as shown. What is the total perimeter of the two red triangles?
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The warning triangle
An equilateral triangle contains three congruent rectangles. Two distances on its base are given. What fraction is white?