We've learned that the volume of a cuboid is its length multiplied by its width multiplied by its height ( ).
The area of the green shaded end of the cuboid (the cross section) is , so you can also say that the volume of a cuboid is:
This formula works for all prisms:
a) What is the volume of this triangular prism?
b) What is the volume of this prism?
b) The area of the cross section is and the length is , so the volume is .
Remember that the volume is: