4 (number)
natural number From Wikipedia, the free encyclopedia
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Mathematics
In mathematics, the number four is an even number and the smallest composite number. Four is also the second square number after one. A small minority of people have four fingers on each hand and four toes on each foot.[source?] Four squared is 16, and four doubled is 8.
In geometry, quadrilaterals or tetragons are a kind of shapes called polygons have four sides and vertices, to which squares are quadrilaterals with sides of same length and vertices of the same wideness.
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