The whole cake is 9 cm high and 20 cm across. Each layer of cake is 2cm thick, and each layer is separated by 1 cm of frosting.
1. What is the total volume of the entire cake (including the missing piece)?
2. What is the volume of one layer of frosting (including the missing piece)?
3. What is the volume of all three layers of frosting? (including the missing piece)?
4. What is the volume of one layer of plain cake (without frosting) (including the missing piece)?
5. What is the volume of all three layers of plain cake, without the frosting (including the missing piece)?