Daily question - Geometry problem #1

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stupnik_2_0

Hello! For today, one geometry problem.

A square with side lenght 1 has inscribed semicircle. One line starts at the top left corner is tangent to the semicircle, and ends at the side of the square. What is lenght of the line.

For solution: https://www.youtube.com/watch?v=sCtN40gp7oM