



 
Hi Duncan.
A cubic yard of gravel is one yard × one yard × one yard, perhaps looking like this:
If we slice it into 2 inch slices, we have 36/2 = 18 slices, each of them one yard × one yard (that's one square yard).
So if we just lay them out, the total area is 18 × 1 yard^{2} = 18 yards^{2}.
Hope this helps,
 


Math Central is supported by the University of Regina and The Pacific Institute for the Mathematical Sciences. 