Quadrilateral Rectangle

In Euclidean plane geometry, a quadrilateral is a polygon with four sides and four vertices or corners. Quadrilaterals are simple (not self-intersecting) or complex (self-intersecting), also called crossed. Simple quadrilaterals are either convex or concave. The interior angles of a simple quadrilateral add up to 360 degrees. A parallelogram is a quadrilateral with two pairs of parallel sides. Source-Wikipedia.

Quadrilateral rectangle:

Rectangle is one type of regular quadrilateral. It has four sides. The opposite sides are equal in length. It has four vertices. It has four internal angles which are congruent. There are two diagonals in rectangle. The length of diagonals is equal in length. The sum of internal angles of rectangle is 360 degree.

Area of the rectangle (A) = length x width square unit
Area (A) = l x w
Perimeter of the rectangle = 2(length + width)
Perimeter (p) =2(l x w) unit
Length of diagonal (d) =sqrt(length²+width²)
Diagonal length    =sqrt(l²+w²) unit.

Example problems for rectangle:

1. Find the area and perimeter of rectangle, whose length and width are 5meters and 3 meters respectively.
Solution:
Area of rectangle = l x w square unit.
Given:    Length= 5 meters, Width =4 meters
=5 x 4

Area of rectangle = 20 m²                 
Perimeter of the rectangle   = 2(l + w)
=2(5+ 4)
= 2 (9)

\Perimeter of the rectangle = 18 meters
2. Find the area and perimeter of rectangle, whose length and width are 9meters and 5 meters respectively.
Solution:
Area of rectangle = l x w square unit.
Given:    Length= 9 meters, Width =5 meters
=9 x 5

Area of rectangle = 45 m²                 
Perimeter of the rectangle   = 2(l + w)
=2(9+ 5)
= 2 (14)
Perimeter of the rectangle = 28 meters

My forthcoming post is on Tree Diagram Statistics, samacheer kalvi tamil books will give you more understanding about Algebra

3. Find the area and perimeter of rectangle, whose length and width are 12meters and 6 meters respectively.
Solution:
Area of rectangle = l x w square unit.
Given:    Length= 12 meters, Width =6 meters
=12 x 6
Area of rectangle = 72 m²                 
Perimeter of the rectangle   = 2(l + w)
                                               =2(12+ 6)
                                               = 2 (18)

Perimeter of the rectangle = 36 meters