### Theory:

A trapezium is a quadrilateral with one pair of opposite side parallel.

For the trapezium $$ABCD$$, the following will be true:
• $$AB||DC$$,where $$AB$$ and $$DC$$ are parallel sides
• $$CE ⊥ AB$$, where $$CE$$ is perpendicular to $$AB$$
• $$DF ⊥ AB$$, where $$DF$$ is perpendicular to $$AB$$
• $$CE = DF = h$$, where $$h$$ is the height of the trapezium