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)

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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