Question

A closed cubical box of edge 20cm is made of wood of thickness 2cm. find.vol of wood used to make it.vol of air trapped in it..

Answer 1

The dimension of the box is 20 cm × 20 cm × 20 cm. And the wood is 2 cm thick.
Therefore, the volume of air trapped in it will be (20-2) cm × (20-2)cm × (20-2)cm = 5832 cm³.
The volume of wood will be the size of the box (using the original dimension of the box) minus the air trapped inside.
So the volume of wood = 20 cm × 20 cm × 20 cm - 18 cm × 18 cm × 18 cm = 2168cm³.

Answer 2

Answer:The dimension of the box is 20×20×20

And the wood = 2cm thick

The volume of air trapped in it will be

(20-2)cm ×(20-2)cm × (20-2)cm ×

= 5832 cm cube

The volume of wood will be the size of box

So, volume of wood

= 20×20×20-18×18×18

=2168cm cube

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