Find how much wood was used in making a
cubical pen stand of side 9 cm and thickness
2 cm.
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162 cubic cm
Given the side and thickness of cubical pen stand 9 cm and 2 cm respectively of cubical pen stand which was made by using woof. we have to find that how much wood was used
Volume of cube of side 9 cm is a^{3}=9^{3}=729 cm^{3}a
3
=9
3
=729cm
3
Now, given that the thickness is 2 cm, then the side of inner cube will become 9-2-2=7 cm. But the top was open so at the top due to thickness the volume is calculated as 9(9)(7)=567 cubic cm
Wood used is Volume of outer cube - volume of inner
= 729-567=162 cubic cm
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