NCERT Solutions for Class 7 Maths Chapter 11 Perimeter and Area Exercise 11.2

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NCERT Solutions for Class 7 Maths Chapter 11 Perimeter and Area Exercise 11.2 is provided as a PDF in this article below. Perimeter and Area are commonly used terms in the field of Geometry and Mensuration. Perimeter is the length of the boundary of a geometrical figure.

Some of the important perimeter formulas are:

  • Perimeter of square - 4a
  • Perimeter of Rectangle - 2(l + b)
  • Circumference of Circle - 2πr

Download PDF: NCERT Solutions for Class 7 Maths Chapter 11 Exercise 11.2

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Examples of Class 7 Chapter 11 Perimeter & Area

Ques 1. Calculate the perimeter of an equilateral triangle of side 3 cm.

Ans. We know the triangle has 3 equal sides.

Thus by adding the 3 equal edges, we can get the total perimeter of the triangle.

Perimeter of triangle = 3 + 3 + 3 = 9 cm.

Ques 2. Calculate the circumference of a circle of radius 7 cm.

Ans. We know that, 

Circumference of Circle - 2πr

here , r = 7 cm

Circumference = 2 x 22/7 x 7

Circumference = 44 cm

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