The perimeter of right circular conen is 8 cm if the height of the cone is 21 cm find its volume
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perimeter is 8
so that 'r' will be 2πr = 8
:) r= 8/2π
:) r= 4/ 3.141 ( π = 3.141)
:) r= 1.27
given,
h = 21cm
volume of cone = πr^2 h/3
= 3.141 × 1.62× 21/3
= 3.141× 1.62× 7
= 35.61cm^3
so that 'r' will be 2πr = 8
:) r= 8/2π
:) r= 4/ 3.141 ( π = 3.141)
:) r= 1.27
given,
h = 21cm
volume of cone = πr^2 h/3
= 3.141 × 1.62× 21/3
= 3.141× 1.62× 7
= 35.61cm^3
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