Foursquare originated around the 1940's
A triangle with five sides is a pyramid. There are four sides that originate from each of the four edges of the bottom square, which is the fifth side.
square(answered by a two year old)
Italy
4
Somewhere in California, apparently.
A four-sided polygon with four congruent sides and four equal angles is a square
1497
1850
In 1924.
200BC
1873
-1,0,or 1 the negative square root of four is negative two and the square root of four is two