Mathematics for IGCSE & O level - Geometrical Constructions (Section 3 - No. 9)
How can you estimate the volume of a cuboid if you have its net drawn on a square grid?
Multiply the areas of all the faces.
Multiply the number of squares along the length, width, and height.
Add the areas of the faces.
Find the surface area.
Explication
The volume is determined by multiplying the dimensions derived from the grid.