Volume of figures made of unit cubes
KEY NOTES!
Definition of Volume: Volume is the amount of space inside a 3-dimensional object. It’s like how much water or air something can hold.
Calculating Volume:
Rectangular Solid or Cuboid = l × w × h (l= Length , w = Width, h = Height)
Cube = a3( a = Length of edge or side)
Cylinder = πr2h (r = Radius of the circular base, h = Height)
Prism = B × h (B = Area of base, (B = side2 or length.breadth) ,h = Height)
Counting Unit Cubes
To find the volume of a shape, count how many unit cubes fit inside it. Arrange them neatly and count them one layer at a time.
Learn with an example
⚫ What is the volume of this object?
___ cubic units
- There are 2 rows with 3 cubes in each row.
- Multiply to find the volume:
2 × 3 = 6 - There are 6 cubes. The volume is 6 cubic units.
⚫ What is the volume of this object?
_____ cubic units
- There are 2 rows with 2 cubes in each row.
- Multiply to find the volume:
2 × 2 = 4 - There are 4 cubes. The volume is 4 cubic units.
⚫ What is the volume of this object?
_____ cubic units
- There are 2 rows with 2 cubes in each row.
- Multiply to find the volume:
2 × 2 = 4 - There are 4 cubes. The volume is 4 cubic units.
Let’s practice!🖊️
