let
a------> length of the desk
b-------> wide of the desk
D------> diagonal of the desk
we know that
D=53.7 in
a=48 in
b=?
applying the Pythagoras Theorem
D²=a²+b²
b²=D²-a²----> b²=53.7²-48²----> b²=579.69-----> b=√579.69
b=24.08 in------> 24 in
the answer is
24 in
