1. The problem is to understand what the symbol $h$ means in the context of a trapezoid (trapezium). 2. In geometry, a trapezoid is a quadrilateral with at least one pair of parallel sides. 3. The formula for the area $A$ of a trapezoid is: $$A = \frac{(b_1 + b_2)}{2} \times h$$ where $b_1$ and $b_2$ are the lengths of the two parallel sides (bases), and $h$ is the height. 4. The height $h$ is the perpendicular distance between the two parallel sides. 5. It is important that $h$ is measured at a right angle to the bases, not along the slant sides. 6. Knowing $h$ allows you to calculate the area accurately by multiplying the average length of the bases by this height. In summary, $h$ in a trapezoid represents the height, which is the perpendicular distance between the two parallel sides.