## NCERT & Cbse class 5 maths Perimeter, Area and Volume

**In this post, we are going to explain CBSE class 5 maths **Perimeter, Area and Volume of different polygons.

** Perimeter :** The distance around a figure is the perimeter of the figure. The perimeter of some polygons can be calculated directly by using a formula. We will now learn to calculate the perimeter of a rectangle and square by using a formula.

__Perimeter of a Rectangle = 2(length + breath)__

In the rectangle shown, the perimeter will be the sum of all its sides.

Therefore, perimeter = l+b+l+b

= l+l+b+b

= 2l+2b=2(l+b)

__Perimeter of a Square = 4×side__

In the square shown, the perimeter will be the sum of all its sides.

Therefore, perimeter = s+s+s+s= 4s

__Perimeter of a Triangle = Sum of its 3 sides.__

__Area __

The amount of surface covered by a figure is known as the area of the figure. Area is always measured in square units. A square of a side 1 unit like 1 cm or 1m, is used as the standard unit of area. Given here is a square of side 1 cm. We say that the square has an area of 1 square centimeter. T can also be written as 1sq cm or 1 cm^{2}.

The number of units needed to cover a surface is called its area.

__Area of a rectangle = length × breath__

__Area of Square = side × side = (side)2 __

__Area of Triangle = ½ of the area of the rectangle. =1/2 × length × breath__

Diagonal is a line segment which joins two opposite vertices of a figure. Congruent stands for identical.

** Area of figures not covering whole squares** – there are some shapes which donot cover the whole squares or complete squares. To find the area of such figures, we have to consider half-squares besides complete squares.

The figure given below is covering 8 complete squares and 2 half squares. We can treat 2 half squares as 1 whole square.

So, area of the figure = 8+1 = 9 sq units.

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