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प्रश्न
Find the volume of a right circular cone with:
height 21 cm and slant height 28 cm.
उत्तर
From the relation
`l^2=r^2+h^2,`we have
`r=sqrt(l^2-h^2)=sqrt((28)^2)-(21)^2=7sqrt7cm`
So, volume of cone =`1/3xxpir^2xxh`
`=1/3xx22/7xx(21)^2xx(7sqrt7)^2`
`=7546cm^3`
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