Projectile over a Square (part -2)

A Square rests on a horizontal plane in such a way that the diagonals of the square are vertical and horizontal. A projectile is thrown from level ground in such a way that the projectile touches all the three vertices which lie in air. If side length of square is \(20\) metres then find the angle of projection.
Note: The angle of projection is of the form \(\theta = tan^{-1}a\sqrt{b}\)

Find \( a + b\)

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