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A square sheet of paper has area 15. The front side is white and the back side is black. A corner of the sheet is lifted and placed so that the crease is at a 45 degree angle. If the fold is such that the visible black area is equal to the visible white area, how many centimeters long is the crease? Express your answer in simplest radical form. 

 Jan 28, 2025
edited by abc234  Jan 28, 2025
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The length of the crease is (3√6) / 2 centimeters.

 Jan 29, 2025

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