One corner of a rectangular piece of paper is folded back and forth to the opposite side. What is the proportion red : blue?
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The secret document
Tag: folding
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The sneak peek
A rectangle with given side lengths is folded back and forth such that the corner touches the opposite side as shown. What is the minimal shaded fraction?
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Take five origami
Divide a rectangular piece of paper in five pieces of equal area. You only have a pair of scissors at your disposal, but you are allowed to make straight folds to guide you.
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The kingsize bed
A rectangle with an inscribed right triangle. What is ac/bd?
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The folded napkin
A square sheet of paper is folded symmetrically from a corner. If the fold length is 4, what is the area of the triangle formed by the other three corners?
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The bobline
A regular hexagon is folded back and forth along the dotted line. What fraction of the area is yellow?
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The folded triangle
An equilateral triangle is folded with its left side at right angles with the base. What fraction of the total triangle is shaded?
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The folded sheet
A rectangular sheet of paper is folded in such a way that two equal angles are formed as shown. What fraction of the resulting quadrilateral is shaded?