Etymology
The word "quadrilateral" derives from two Latin words:
Meaning
A quadrilateral is a polygon with four sides and four vertices. It is a two-dimensional figure that has a closed, non-intersecting boundary.
Origin
The concept of a quadrilateral has been known since ancient times. The first known use of the term "quadrilateral" appeared in the writings of the Greek mathematician Euclid (c. 300 BC). In Book I of his Elements, Euclid defined a quadrilateral as a figure with four straight sides.
Over the centuries, the definition of a quadrilateral has been refined and expanded. In modern geometry, a quadrilateral is typically defined as a polygon with four vertices and four sides, which may be of equal or unequal length.
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