Answer
Shortest side = 2.5
Side opposite 60° $\approx 4.3$
Work Step by Step
The longest side of a 30°–60°–90° triangle is twice the shortest side and the side opposite the 60° angle is $\sqrt 3$ times the shortest side.
Given that
Longest side = 5
Therefore
Shortest side = $\frac{longest side}{2}$ = $\frac{5}{2}$ = 2.5
Side opposite 60° = $\sqrt 3\times $ shortest side = $\sqrt 3 \times$2.5 = 2.5$\sqrt 3$
Side opposite 60° $\approx 4.3$
