Question 1074839
If drawn carefully as described,  since angle ASU is 90 degrees, then angle UST is also 90 degrees.  


If drawn to show angle USV adjacent to angle VST, then the sum of measures must be 90 degrees.


USV + VST = UST
USV + 37 = 90
USV = 90 - 37
USV = 53


Angle USV measures 53 degrees.