15. A right-angled triangle was cut along a straight line into two parts and these parts were assembled into a square (see fig). What is the length of the shorter leg if the longer leg is 10?
![](https://cdn.mathpix.com/cropped/2024_05_06_35052e7d512455511f98g-01.jpg?height=508&width=828&top_left_y=1091&top_left_x=615)

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# Answer 5.

Solution: The short leg is equal to the side of the square, and the long leg is twice the side of the square.