This is where we apply Pythagoras Theorem :) . So lets first construct the above answer. So I constructed it below. Now you have to apply this formula,
a²= 48²+27². Which means a²= 2304+729 which is 3033. Then you take the square to the other side which will give you the formula, a=√3033 which is 55.07267925. You can either estimate it(55.1) or write this as the answer. Hope it helps please vote it the brainiest answer!