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?
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.
A rectangle with an inscribed right triangle. What is ac/bd?
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?
A regular hexagon is folded back and forth along the dotted line. What fraction of the area is yellow?
An equilateral triangle is folded with its left side at right angles with the base. What fraction of the total triangle is shaded?
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?