A trapezium is divided by two upright lines from its top corners and one line across the middle, as shown. How many quadrilaterals are there in the figure?

Every four-sided figure lies between two of the side boundaries (a slanting side or an upright). Top band: both must pass through a top corner, $2\times 2=4$. Bottom band: any 2 of the 4 boundaries, $\left(\genfrac{}{}{0ex}{}{4}{2}\right)=6$. Full height: $2\times 2=4$. Total $4+6+4=14$.