Question

find how much wood was used in making a cubical pen stand of sde 9cm and thickness 2cm
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Answer 1

Answer:

Wood used is 162 cubic cm

Step-by-step explanation:

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

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

hope it helps.