Answer:
4 units
Explanation:
From the figure, it is given that ABC is a triangle and AB=5, BC=3 and AC=4.
Now, In order to get the length of the side opposite B, it can be determined by simply seeing the side opposite to the angle B.
From the given figure, it can be seen that AC is the side opposite to the angle B and is equal to 4, thus the length of the side opposite B measures 4 units.