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  3. The volume of a cone is 18480 cm^3 . If the height of the cone is 40 cm . Find the radius of its base .
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The volume of a cone is 18480 cm^3 . If the height of the cone is 40 cm . Find the radius of its base .

Answers (1)
D Deependra Verma

Solution:  Let the radius of the cone be r  cm . 

      We have , 

                    h= height of the cone = 40 cm and V = Volume of the cone = 18480cm^3

herefore                  frac13 imes frac227 imes r^2 imes40=18480

Rightarrow                 r^2= frac18480 imes3 imes722 imes40=441Rightarrow r=sqrt441cm =21cm

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