Question

The diameter of a right circular cylinder is 21 cm and height is 20 cm. Find its volume.

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Answer 1

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Answer 2

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Here we have to find the volume of the right circular cylinder . We have given the diameter from which we can find out the radius and Haight is also given . Volume of cylinder is taken out by multiplying value of 'pi' with the square of the radius of the cylinder and height of the cylinder .

Diameter of cylinder = 21 cm

Radius of cylinder = $\frac{21}{2}$

Height of cylinder = 20 cm

Now,

➙ Volume of cylinder = πr²h

➙ Volume of cylinder = $\frac{22}{7}$ × ($\frac{21}{2}$)² × 20

➙ Volume of cylinder = $\frac{22}{7}$ × $\frac{441}{4}$ × 20

➙ Volume of cylinder = $\frac{22}{\cancel{7}}$ × $\frac{\cancel{441}}{\cancel{4}}$ × ${\cancel{20}}$

➙ Volume of cylinder = 22 × 63 × 5

➙ Volume of cylinder = 6,930 cm³