Definition: In geometry, a square is a 2dimensional figure with four equal sides and four right (90°) angles. Interactivity 1: Square Directions for interactivity Click and drag points A and B to resize, move and rotate. 
Basic formulas for square with side a : perimeter is: L=4a , and area is: A=a^2 .
Examples with perimeter and area of square

Interactivity 2: Construct a square.

Equivalent Definitions:
Theorems

Related themes:
 Paralelogram?, Rectangle
 Rhombus, Trapezoid, Quadrilateral
 Polygons, Triangles, Kite (Deltoid)
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