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Square
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The square is probably the best known of the quadrilaterals.
It is defined as having all sides equal, and its interior angles all right angles (90°).
From this it follows that the opposite sides are also parallel.
A square is simply a specific case of a regular polygon, in this case with 4 sides.
All the facts and properties described for regular polygons apply to a square.
See Regular Polygons
Attributes
| Vertex |
The vertex (plural: vertices)
is a corner of the square. Every square has four vertices.
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| Perimeter |
The distance around the square. All four sides are by definition the same length, so the perimeter is four times the
length of one side, or:
perimeter = 4s
where s is the length of one side. See also
Perimeter of a square.
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| Area |
Like most quadrilaterals, the area is the length of one side times the perpendicular height.
So in a square this is simply:
area = s2
where s is the length of one side. See also Area of a square.
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| Diagonals |
Each diagonal of a square is the
perpendicular bisector
of the other.
That is, each cuts the other into two equal parts, and they cross and right angles (90°).
The length of each diagonal is
s√2
where sis the length of any one side.
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A square can be thought of as a special case of other quadrilaterals, for example
Related polygon topics
General
Types of polygon
Area of various polygon types
Perimeter of various polygon types
Angles associated with polygons
Named polygons
(C) 2007 Copyright John Page
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