Question

The radius of the base cylinder is 21 cm and its height is 4cm find its volume

Answer 1

Answer:

Given :-

• Radius = 21 cm
• Height = 4 cm

To Find :-

Volume

Solution :-

As we know that

$\star \large \bf \: Volume = \pi {r}^{2} h$

$\sf : \implies \: Volume = \dfrac{22}{7} \times {21}^{2} \times 4$

$\sf \ratio \implies \: Volume \: = \dfrac{22}{7} \times 21 \times 21 \times 4$

$\sf \ratio \implies \: Volume \: = 22 \times 3 \times 21 \times 4$

$\sf \ratio \implies \: Volume \: = 66 \times 84$

$\sf \pink{\ratio \implies \:Volume \: = 5544 \: {cm}^{2}}$

Know More:-

Volume of cylinder = πr²h

T.S.A of cylinder = 2πrh + 2πr²

Volume of cone = ⅓ πr²h

C.S.A of cone = πrl

T.S.A of cone = πrl + πr²

Volume of cuboid = l × b × h

C.S.A of cuboid = 2(l + b)h

T.S.A of cuboid = 2(lb + bh + lh)

C.S.A of cube = 4a²

T.S.A of cube = 6a²

Volume of cube = a³

Volume of sphere = (4/3)πr³

Surface area of sphere = 4πr²

Volume of hemisphere = ⅔ πr³

C.S.A of hemisphere = 2πr²

T.S.A of hemisphere = 3πr²