Etymology:
Latin: quadratus, from quadrare "to make square"
Meaning:
A plane figure with four equal sides and four right angles.
Origin:
The word "quadru" originates from the Latin word "quadrare," which means "to make square." This is because a quadrilateral is a polygon with four sides and four angles, and its sides are all equal in length. The term "quadru" has been used in mathematics since ancient times to describe this type of polygon.
In the 16th century, the word "quadru" was also used to refer to a square dance, which was a popular form of entertainment in Europe at the time. The dance was performed by four couples, and each couple stood at a corner of a square. The couples then moved around the square, performing a variety of steps and turns. The word "quadru" is still used today to describe this type of dance.
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