3. What do prisms have in common with cylinders? They both have two congruent faces. The process of calculating volume for them is similar.

4. If we know the base, how do we calculate the volume? Let’s try an example for each.

5. Example (Cylinder) A cylinder has radius 2cm and length / height 9cm. Calculate its volume.

6. Example (Triangular Prism) A triangular prism properties as shown above. Calculate its volume.

8. Have a look at the cube below. All diagonals meet at the centre and divide the cube into six. square-based pyramids If the cube is cut into half (to form a cuboid), the apex of a pyramid will touch the top and base will be at the bottom. The pyramid has a third of the volume of the cuboid. This is the coefficient added to the formula about its base and height.

10. Example 1 Example 2 Which is bigger?