Answer:
The length of the side opposite ∠B measures 4 units.
Step-by-step explanation:
As given the figure in the question be as follow .
AB = 5 unit
BC = 3 unit
AC = 4 unit
Clearly as shown in the figure the sides opposite to the ∠B is AC .
The measure of AC is 4 units .
Therefore the length of the side opposite ∠B measures 4 units.