207. What angle does the diagonal of a square form with its side?
$\Delta$ This is an acute angle in a right isosceles triangle, which equals $45^{\circ} . \triangleleft$
![](https://cdn.mathpix.com/cropped/2024_05_21_90703b5d5e76e3b5cd3dg-068.jpg?height=366&width=182&top_left_y=246&top_left_x=1508)

## A few more problems