Parallelogram (noun)

1. A quadrilateral having opposite sides that are parallel and equal in length.
2. A geometric figure with four sides and opposite sides parallel and equal in length.

Origin:

The term 'parallelogram' comes from the greek words 'parallel' and 'gramma', meaning 'side by side' and 'a line' respectively. it was first used in english in the 16th century.

Examples:

1. In a parallelogram, if one pair of opposite sides is equal, then the other pair is also equal.
2. The area of a parallelogram can be calculated by multiplying the base by the height.
3. The theorem states that in a parallelogram, the opposite angles are equal.
4. Parallelograms are often used in engineering and construction to create strong, stable structures.
5. The diagram of a parallelogram can be easily drawn using only a ruler and a set square.