Question

Volume of cylinder whose diametre is 21 cm and height is 10 cm

Answer 1

Answer:

diameter=21cm

radius=10.5cm

height= 10cm

volume of cylinder=π r^ h

= 22/7 ×(105/10 ) (105/10) ×10

= 345

Answer 2

Given :—
~~~~~~~~~~~
⚪Diameter of cylinder, D = 21 cm

⚪Height of the cylinder, h = 10 cm

To Find :—
~~~~~~~~~~~
⚪VOLUME of Cylinder

Solution :—
~~~~~~~~~~~
radius, r = D/2 = ( 21/2 ) cm

Thus,
volume,
V
$= \boxed{ \pi {r}^{2} h } \: \: \sf cubic \: units\\ \\ \\ = \left[ \frac{22}{7} \times \frac{21}{2} \times \frac{21}{2} \times 10 \right] \: \: \sf {cm}^{3} \\ \\ \\ = \left[ \frac{ {}^{11} \: \cancel{22} }{ \cancel{7} } \times \frac{ \cancel{21} \: {}^{3} }{ \cancel{2} } \times \frac{21}{ \cancel{2} } \times \cancel{10} \: {}^{5} \right] \: \: \sf {cm}^{3} \\ \\ \\ = (11 \times 3 \times 21 \times 5 ) \: \: \sf {cm}^{3} \\ \\ \\ = (11 \times 3 \times 105 ) \: \: \sf {cm}^{3} \\ \\ \\ = (11 \times 315) \: \: \sf {cm}^{3} \\ \\ \\ = 3465 \: \: \sf {cm}^{3}$

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