Answer: The value of b is 22.62
Step-by-step explanation: 20 is the opposite of b, 52 is the hypotenuse. Because we're given the opposite and hypotenuse, we have to use sine. So....
sin b=20/52
sin b = 0.38461538461
then using inverse of sine, the equation would be sin^-1(0.38461538461)
by putting that into the calculator you get 22.61986495 (aka 22.62)