Explanation

Volume is the amount of space inside a 3D object.

• Measured in cubic units (cm³, m³)

Common volume formulas:

• Rectangular prism:
  V = l × w × h

• Cube:
  V = s³

• Cylinder:
  V = πr²h

• Sphere:
  V = (4/3)πr³

Surface area is the total area of all faces on the outside.

• Measured in square units

Examples:

• Cube:
  SA = 6s²

• Rectangular prism:
  SA = 2lw + 2lh + 2wh

Quiz: Volume and Surface Area

1. What units are used for volume?

2. What units are used for surface area?

3. Write the volume formula for a rectangular prism.

4. Which measures the outside: volume or surface area?

5. What is the volume of a cube with side length 3 units?

Answer Key

1. Cubic units

2. Square units

3. V = l × w × h

4. Surface area

5. 27 cubic units