Question:A cone of height`7` cm and base radius `3` cm is curved from a rectangular block of wood `10 cm xx 5 cm xx 2 cm.` The percentange of wood wasted is : 

A `34%` 
B `46%` 
C `54%` 
D `66%` 

+ Answer
A 

+ Explanation
Volulme of the block 

`= (10 xx 5 xx 2) cm^3` 

`= 100 cm^3`

Volume of the cone carved out 

`= (1/3 xx 22/7 xx 3 xx 3 xx 7) cm^3`

`= 66 cm.^3`

Wood wasted 

`= (100 - 66)%`

`= 34%`

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Irin Moni

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