You should be able to
find the volume and surface area of composite figures
Composite figures
Read and try to understand Textbook 1B explanations and worked examples: pg 191 to 192.
To find volume of a composite solid, just find the volume of the particular solid.
Either add or subtract depending on the composite solid formed.
Volume of solid: Volume of bottom big cuboid plus volume of top smaller cuboid.
Start watching from time: 3.55 to end of video
Volume of solid: Volume of big cylinder subtract volume of inner smaller cylinder.
Start watching from time: 0.00 to 4.18
Volume of solid: Volume of cuboid subtract volume of inner cylinder.
Volume of solid: Volume of bottom cuboid plus volume of top triangular prism.
Start watching from time: 0.00 to 4.03
Volume of solid: Volume of prism subtract volume of inner cylinder.