Explanation:
Square (geometry)
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Square
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A square is a regular quadrilateral.
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In geometry, a square is a regular quadrilateral. This
means that it has four equal sides and four equal angles (90 degree angles, or right angles). A square with vertices ABCD would be denoted 
ABCD.
Perimeter
The Perimeter of a square whose
sides have length t is
(Our
solved example in mathguru.com uses this concept)
http://en.wikipedia.org/wiki/Square_(geometry)
Rectangle
In Euclidean plane geometry, a rectangle is any quadrilateral with four right angles. A rectangle with vertices ABCD would be denoted as 
ABCD.
If a
rectangle has length l and width w
It has perimeter P = 2l + 2w = 2(l + w), (Our solved example in
mathguru.com uses this concept)
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Rectangle
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The formula
for the perimeter of a rectangle.
http://en.wikipedia.org/wiki/Rectangle
The above explanation is copied from
Wikipedia, the free encyclopedia and is remixed as allowed under the Creative
Commons Attribution- ShareAlike 3.0 Unported License.