We had found area of rectangle by counting the squares

But, that method is too long

 

To find area of any rectangle,

We use formula

 

For a rectangle with length l and breadth b

41.jpg

Area of rectangle = l × b

 

Comparing counting the squares method to formula

42.jpg

 

Find area of rectangle with length 10 m and breadth 15 m

43.jpg

 

Length = l = 10 m

Breadth = b = 15 m

 

       Area of rectangle = l × b

            = 10 × 15

    = 150 sq. m

    = 150 m 2

  1. Chapter 11 Class 7 Perimeter and Area
  2. Concept wise

Transcript

We have, 15 full squares So, Area = 15 sq. cm = 15 cm2 Length = l = 5 cm Breadth = b = 3 cm Area of rectangle = l × b = 5 × 3 = 15 cm2

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Davneet Singh
Davneet Singh is a graduate from Indian Institute of Technology, Kanpur. He has been teaching from the past 8 years. He provides courses for Maths and Science at Teachoo. You can check his NCERT Solutions from Class 6 to 12.