  If you like what you see in Mathguru
Subscribe Today
 For 12 Months US Dollars 12 / Indian Rupees 600 Available in 20 more currencies if you pay with PayPal. Buy Now No questions asked full moneyback guarantee within 7 days of purchase, in case of Visa and Mastercard payment WyzAnt Tutoring

Example: On Concept of Area

 Post to:   Explanation:

# Rectangle

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.

## Formulas 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.

http://en.wikipedia.org/wiki/Rectangle