The height of trapezoid VWXZ is 8 StartRoot 3 EndRoot units. The upper base,VW, measures 10 units. Use the 30°-60°-90° triangle theorem to find the length of YX.

Answer is 45 degrees

SQRS being a square it means all of its corners are 90 degrees.
If T is the middle point of the the square. Exacted in the center of the square.

In a square the diagonals are always at a 45 degrees therefore the angle formed by SPT is 45