Thus, by this definition, a parallelogram is not a trapezoid.
In the above diagram, the bases of the given trapezoids are $AB$ and $DC$, $EF$ and $HG$, and $IJ$ and $KL$.
In the above diagram, the legs of the given trapezoids are $AD$ and $BC$, $EH$ and $FG$, and $IK$ and $JL$.
In the above diagram, the heights of the given trapezoids are indicated by the letter $h$.
Also defined as
Also known as
Outside the US (one of a few countries that use this definition), this figure is known as a trapezium.
- Results about trapezoids can be found here.
In the words of Euclid:
- Of quadrilateral figures, a square is that which is both equilateral and right-angled; an oblong that which is right-angled but not equilateral; a rhombus that which is equilateral but not right-angled; and a rhomboid that which has its opposite sides equal to one another but is neither equilateral nor right-angled. And let quadrilaterals other than these be called trapezia.