Hopefully the 23Ft is the bottom side.
This means you have the side Adj and you are finding the height (Opp).
Tan = Opp/Adj
Tan 52 = Opp/ 23
Opp = Tan 52 * 23
Opp = 29Ft to nearest integer.
If the other side is the 23Ft just do the same thing using Sin intead of Tan.