#ThatCrease though...

Geometry Level 3

Folding a rectangular sheet of paper with length l l and width w w in half along one of its diagonals, as shown in the figure below, reduces its "visible" area (the area of the pentagon below) by 30 % 30\% . What is l w ? \frac{l}{w}?

5 2 \frac{\sqrt{5}}{2} 4 3 \frac{4}{3} 5 \sqrt{5} 2 3 \frac{2}{\sqrt{3}}

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