Assuming it is cut 'square' (not a square shape, but all cuts are at right angles), then the volume is Length x Width x Height
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Cubic units.
Density of wood = mass/volume
If its a cuboid, volume = length * breadth * height .
you weigh the block on a balance get its mass if it is a regular shape block so the volume should be length * weadth * breadth (side * side * side) the density = mass / volume
answer 200