1. Noun. (plural of quadrilateral) ¹

¹ Source: wiktionary.com

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Below you will find example usage of this term as found in modern and/or classical literature:

1. Euclid's Elements of Geometry by Henry Martyn Taylor (1893)
"Prove that, if ABCD, EFGH be two quadrilaterals which are equiangular to one another and are such that the ratios AB to El'', and BC to FG are equal, ..."

2. A History of Greek Mathematics by Thomas Little Heath (1921)
"(y) quadrilaterals. It is unnecessary to give in detail the methods of measuring the areas of quadrilaterals (chaps. 11-16). Heron deals with the following ..."

3. A Treatise on Special Or Elementary Geometry by Edward Olney (1882)
"Two quadrilaterals are equal when the following parts are equal, each to each, ... The triangles into which either diagonal divides the quadrilaterals. 2. ..."

4. A Treatise on Special Or Elementary Geometry: Including an Elementary, and by Edward Olney (1879)
"Two quadrilaterals are equal when the following parts are equal, each to each, ... The triangles into which either diagonal divides the quadrilaterals. 2. ..."

5. Catalogue of Scientific Papers, 1800-1900: Subject Indexby Royal Society (Great Britain), Herbert McLeod by Royal Society (Great Britain), Herbert McLeod (1908)
"Folie, F. Brux. Ac. Bll. 37 (1874) 811-. quadrilaterals, Quadrangles, and related Conic». Circum - quadrilaterals, Newton's theorem, demonstration. ..."

6. Mathematical Questions and Solutions by W. J. C. Miller (1871)
"Find the average area of the quadrilaterals whose angular points are the centre of a given circle and three points taken at random on its circumference. ..."

7. Junior High School Mathematics: First [-third] Course by William Ledley Vosburgh, William Frederick Gentleman (1918)
"Classification of quadrilaterals. — A quadrilateral is a plane figure inclosed by ... A. quadrilaterals are divided into three groups: (a) Parallelogram, ..."

8. A Treatise on Special Or Elementary Geometry by Edward Olney (1879)
"Two quadrilaterals are equal when the following parts are equal, each to each, ... The triangles into which either diagonal divides the quadrilaterals. 3. ..."