Question

Find the volume of cylinder having height of 21 cm and area of base as 138 CM^2

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Answer 1

Answer:2898 cm^3

Step-by-step explanation:

Given,Height of the cylinder 'h'=21cm

         Area of base 'A'=138 cm^2

         A= pi *R*R

        138=22/7*R^2

        R=43.90909091

         V=pi*R^2*h

       V=22/7*(43.909091)^2*21

      V=2898 cm^3

Answer 2

Answer:

$2898 {cm}^{3}$

Step-by-step explanation:

Given : h=21cm,

Area of the base(A)= 138cm^2

Here,

hence the base of the cylinder is circular.

Area of the circle =138cm^2

$\pi \times r ^{2} = 138cm^{2}$

${r}^{2} = 138 \div \pi$

Volume of cylinder =

$\pi {r}^{2} \times h$

=

$\pi \times 138 \div \pi \times h$

138×21

=2898 cm^3

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