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Example: On Concept of Area

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In Euclidean plane geometry, a rectangle is any quadrilateral with four right angles. The term "oblong" is occasionally used to refer to a non-square rectangle. A rectangle with vertices ABCD would be denoted as  ABCD. A so-called crossed rectangle is a crossed (self-intersecting) quadrilateral which consists of two opposite sides of a rectangle along with the two diagonals. Its angles are not right angles.




The formula for the perimeter of a rectangle.

If a rectangle has length l and width w

1.  It has area A = lw, (Our solved example in mathguru.com uses this concept)

2.  It has perimeter P = 2l + 2w = 2(l + w),

3.  Each diagonal has length ,

4.  When l = w, the rectangle is a square.




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.