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Mensuration Summary Class 6 Maths Chapter 9

Perimeter

  • Perimeter is the distance covered along the boundary forming a closed figure when you go round the figure once.
  • Perimeter of a rectangle = 2 × (length + breadth)
  • Perimeter of a square = 4 × length of a side.
  • Perimeter of an equilateral triangle = 3 × length of a side.
  • Perimeter of a regular pentagon = 5 × length of one side.

Area

  • The amount of surface enclosed by a closed figure is called its area.
  • To calculate the area of a figure using a squared paper:
    (a) Ignore portions of the area that are less than half a square.
    (b) If more than half a square is in a region. Count it as one square.
    (c) If exactly half the square is counted, take its area as 1/2 sq units.
  • Area of rectangle = length × breadth.
  • Area of a square = side × side.
The document Mensuration Summary Class 6 Maths Chapter 9 is a part of the Class 6 Course Mathematics (Maths) Class 6.
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FAQs on Mensuration Summary Class 6 Maths Chapter 9

1. What is the definition of perimeter?
Ans. The perimeter is the total length of the boundary of a closed figure. In other words, it is the sum of all the sides of the figure.
2. How is the perimeter of a rectangle calculated?
Ans. The perimeter of a rectangle is calculated by adding the lengths of all its four sides. It can be represented as 2 times the sum of the length and width of the rectangle.
3. Is the perimeter of a square always equal to four times its side length?
Ans. Yes, the perimeter of a square is always equal to four times its side length. Since all sides of a square are equal, adding the length of each side gives us four times the side length.
4. Can the perimeter of a triangle be greater than the sum of its three sides?
Ans. No, the perimeter of a triangle can never be greater than the sum of its three sides. The perimeter is calculated by adding the lengths of all three sides, so it is always equal to or less than the sum of the sides.
5. How is the perimeter of a circle calculated?
Ans. The perimeter of a circle is also known as its circumference. It is calculated by multiplying the diameter of the circle by the mathematical constant pi (π), which is approximately 3.14. Therefore, the formula for the perimeter of a circle is π times the diameter or 2 times π times the radius.
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