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quadrilateral

quadrilateral

1 5.3
A flat shape with four straight sides and four angles
  • noun
  • /ˌkwɒdrɪˈlætərəl/
translation icon : cuadrilátero
  • In geometry class, we learned that a square is a special type of quadrilateral because it has four equal sides.

That is your largest small quadrilateral.

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Examples

  • The sign at the park entrance was a large, curve-edged quadrilateral of rough pine, covered with hardy brown paint highlighted by dull yellow lettering.

    Fiction book (1997)
  • First of all, we want a quadrilateral, not a Pentagon.

  • Then she drew some angled lines, shading in the quadrilateral.

    Fiction book (2000)
  • For instance, a rectangle could be defined as a parallelogram with one right angle, or as a quadrilateral with four right angles.

    Academic text (2015)
  • The images shown in the plan as transparent quadrilaterals have been flung about the room recklessly; the effect, more than anything, is that they have been hurled from the vanishing point at the viewer.

    Academic text (2000)
  • The architect designed a stunning house with large windows shaped like quadrilaterals on each side.

  • During the math competition, each team was required to find the area of various quadrilaterals using different formulas.

Synonyms

quadrangle
vsquadrilateral
  • Specialized
1 6.7

A shape with four straight sides and four angles

has identical meaning but differs only by name form
tetragon
vsquadrilateral
1 8.0

A flat shape with four sides and four corners

has identical meaning but uses an alternative name form

How Many-Sided

polygram
  • Specialized
8.9
octagon
7 3.3
hexagon
5 2.8
pentagon
1 3.0
quadrilateral
1 5.3
triangle
58 1.0

Surface Forms

quadrilateral singular

Morphology

quadrilateral = lateral (semi-transparent) = quadri + lateral

The meaning is built from 'quadri-' plus 'lateral' to express 'four-sided', but the classical combining form and learned base make it slightly less immediate for many learners.

Etymology

The word quadrilateral comes from the parts quadri- and -lateral, which mean 'four' and 'side'. So a quadrilateral is a flat shape with four sides.