Square (geometry)
From AoPSWiki
A square is quadrilateral in which all sides have equal length and all angles are right angles.
Equivalently, the squares are the regular quadrilaterals.
Contents |
Introductory
Area
The area of a square can be found by squaring the square's side length: the area 
of a square with side length 
is 
.
Perimeter
The perimeter 
of a square can be found by multiplying the square's side length by four - 
.
Diagonal
The length of either diagonal of a square can be obtained by the Pythagorean theorem. 
