Question

In a right ∆ABC, ∠B = 90°. Find the longest side.

Answer 1

In right $∆ABC$, we have:
$\angle B=90°$
$$\begin{gathered} \angle A+\angle C=90° \\ \therefore \angle A,\angle C<\angle B \end{gathered}$$
The side opposite to $\angle B$, i.e., side AC, is the longest.