rhomboid

A rhomboid is a parallelogram that is neither a rhombus nor a rectangle. The word rhomboid comes from the Greek word $\rho o \mu \beta o \varepsilon \iota \delta \acute\eta \varsigma$ , which is transliterated as `rhomboeidis'. In The Elements, Euclid has this definition:

``Of quadrilateral figures....a rhomboid (is) that which has its opposite sides and angles equal to each other but is neither equilateral nor right-angled.''

Below is a picture of a rhomboid.

The formula for the area of a rhomboid is the same as that for all parallelograms: If $b$ is the length of its base and $h$ is the length of its height, then $A=bh$ .