We‌ ‌have‌ ‌learned‌ ‌about geometry shapes – open and closed figures, plane figures and solid shapes, etc., ‌in‌ ‌our‌ ‌previous‌ ‌class.‌ ‌

In this chapter, we will be learning about the area, volume, and perimeter of these solid shapes.

What is a Perimeter

The perimeter of a simple or carved figure is the total measure of the length covered, going around the figure once. The measure of the total length around a figure is called its perimeter.

  • The perimeter of the rectangle = Length + breadth + length + breadth (or)2 * length + breadth.
  • The perimeter of the square = 4 * measure of side (or) the sum of the measures of all four sides.
  • The perimeter of a triangle = The sum of the measures of all three sides.

What is Area

The measure of the space occupied by a plane surface is called its area. The area is written in square units.

  • The area of a square = side×side (square units)
  • The area of a rectangle = length × breadth (square units)

What is Volume

The space occupied or covered by any solid is called its volume. The unit of volume is cubic centimetre, cubic metre etc.

  • Volume of a cube = side * side * side

A cube is an object whose length, breadth and height are equal

  • Volume of a cuboid = length * breadth * height

A cuboid is an object whose length, breadth and height are not equal.

Stay tuned to BYJU’S for more information on NIOS, syllabus, notes, along with its important questions and solutions.


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