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# parallelogram

## Definitions

### from The American Heritage® Dictionary of the English Language, 4th Edition

• n. A four-sided plane figure with opposite sides parallel.

• n. A convex quadrilateral in which each pair of opposite edges are parallel and of equal length.

### from the GNU version of the Collaborative International Dictionary of English

• n. A right-lined quadrilateral figure, whose opposite sides are parallel, and consequently equal; -- sometimes restricted in popular usage to a rectangle, or quadrilateral figure which is longer than it is broad, and with right angles.

### from The Century Dictionary and Cyclopedia

• n. In geometry, a quadrilateral whose opposite sides are parallel.
• n. A pantograph.

• n. a quadrilateral whose opposite sides are both parallel and equal in length

## Etymologies

### from The American Heritage® Dictionary of the English Language, 4th Edition

Late Latin parallēlogrammum, from Greek parallēlogrammon, from neuter sing. of parallēlogrammos, bounded by parallel lines : parallēlos, parallel; see parallel + grammē, line; see gerbh- in Indo-European roots.

## Examples

• *This is reputed to be the first rock song to contain the word parallelogram in it.

In praise of … Lemmy | Editorial

• A square only requires a peg at each corner, with a chalked string drawn from peg to peg; and an oblong, or parallelogram, is made by joining two common squares, and taking off the corners if required.

The Lady's Country Companion: or, How to Enjoy a Country Life Rationally

• This addition rule is known as the parallelogram law.

Quantum Mechanics

• This game is played by marking out in the dust or sand a parallelogram, which is subdivided into a varying number of compartments.

Philippine Folk-Tales

• When opposite sides of the figure are parallel to each other it is termed a parallelogram, no matter what the angle of the adjoining lines in the figure may be.

Mechanical Drawing Self-Taught

• She was particularly perplexed by geometry; she aroused our hilarity by always calling a parallelogram a parallel-O-gram, with a strong emphasis on the penultimate syllable; and she spent several days repeating over to herself, with a mystified countenance, the famous words, "The square of the hypothenuse is equal to the sum of the squares of the two legs."

Hawthorne and His Circle

• This evening Mr. Spong come, and sat late with me, and first told me of the instrument called parallelogram,

Diary of Samuel Pepys, Sep/Oct 1668

• When the diagonals of the original quadrilateral are congruent, then the parallelogram is a rhombus.