The Properties of a Rectangle
Definitions and formulas for the perimeter of a rectangle, the area of a rectangle, how to find the length of the diagonal of a rectangle, properties of the diagonals of a rectangle
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perimeter of a rectangle  area of a rectangle  properties of the sides and angles of a rectangle 
diagonal of a rectangle  properties of the diagonals of a rectangle 
The perimeter of a rectangle:  
To find the perimeter of a rectangle, just add up all the lengths of the sides: Perimeter = L + w + L + w 

The area of a rectangle:  
To find the area of a rectangle, just multiply the length times the width: Area = L x w 

The sides and angles of a rectangle: 
Opposite sides of a rectangle are the same length (congruent). The angles of a rectangle are all congruent (the same size and measure.) Remember that a 90 degree angle is called a "right angle." So, a rectangle has four right angles. Opposite angles of a rectangle are congruent. 