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Line 42: − + − − In [[geometry]], [[quadrilateral]]s or tetragons are a kind of [[shape]]s called [[polygon]]s have four [[side]]s and [[vertices]], to which [[square]]s are quadrilaterals with sides of same length and vertices of the same wideness. − − − + + − − File:Vier.jpg|Two modern handwritten fours Line 62:
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KS update 1.4
== Mathematics ==
== Mathematics ==
In [[mathematics]], the number four is an [[even number]] and the smallest [[composite number]]. Four is also the second [[square number]] after [[one]].
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 [[finger]]s on each [[hand]] and four [[toes]] on each [[foot]].{{Citation needed|date=December 2022}} Four squared is 16, and four doubled is 8.
A small minority of people have four [[finger]]s on each [[hand]] and four [[toes]] on each [[foot]].
== 4 (number) Media ==
== 4 (number) Media ==
<gallery widths='160px' heights='100%' mode='traditional' caption=''>
<gallery widths='160px' heights='100%' mode='traditional' caption=''>
File:Vier.jpg|Two modern handwritten fours
File:Evolution4glyph.png|:Evolutionglyph
File:Evolution4glyph.png|:Evolutionglyph
File:Algund Dominikanerinnenklosterkirche Portal bezeichnet 1481 (cropped).jpg|Sculpted date "1481" in the Convent church of Maria Steinach in [[Algund]], [[South Tirol]], [[Italy]]. The upward loop signifies the number 4.
File:Algund Dominikanerinnenklosterkirche Portal bezeichnet 1481 (cropped).jpg|Sculpted date "1481" in the Convent church of Maria Steinach in [[Algund]], [[South Tirol]], [[Italy]]. The upward loop signifies the number 4.
File:Mugs of tea viewed from above.jpg|Four plastic mugs viewed from above. Three contain tea; one is empty. The mugs are on the floor of a Land Rover.
File:Mugs of tea viewed from above.jpg|Four plastic mugs viewed from above. Three contain tea; one is empty. The mugs are on the floor of a Land Rover.
</gallery>
</gallery>
{{Math-stub}}
{{Citation needed|date=December 2022}} Four squared is 16, and four doubled is 8.
In [[geometry]], [[quadrilateral]]s or tetragons are a kind of [[shape]]s called [[polygon]]s have four [[side]]s and [[vertices]], to which [[square]]s are quadrilaterals with sides of same length and vertices of the same wideness.
[[Category:Square numbers]]
[[Category:Square numbers]]
[[Category:Integers]]
[[Category:Integers]]