Question

Find the area of a cylinder with radius 7cm and hieght 21cm

Answer 1

Answer:

1232 cm²

Step-by-step explanation:

Given,

Radius of Base of Cylinder = r =7 cm

Height of Cylinder = h = 21 cm

Area of Cylinder = 2πr(r+h)

                           = 2 x (22/7) x 7 x (7+21)

                           = 1232 cm²

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Answer 2

Answer:

C.S.A = 924 cm²

T.S.A =25872cm²

Step-by-step explanation:

Given :

Radius = 7cm

Height = 21cm

To find :

Area = ?

• Total surface area =?

• Curved Surface area =?

Formula Used :

$\sf \: c.s.a \: of \: a \: cylinder = 2\pi \: r \: h$

$\sf \: c.s.a \: of \: cylinder= 2 \pi \: r (r + h)$

Procedure :

• Finding CSA

$\sf \: c.s.a = 2 \times \frac{22}{7} \times 7 \times 21$

$\sf \implies\: c.s.a = 2 \times 22 \times 21$

$\sf \implies \: 44 \times 21$

$\sf \implies \: 924 {cm}^{2}$

• Finding TSA

$\sf \: t.s.a = 2 \times \frac{22}{7} \times 7 \times 21(7 + 21)$

$\sf \implies \: t.s.a = 2 \times 22 \times 21 \times 28$

$\sf \implies \: t.s.a = 44\times 21 \times 28$

$\sf \implies \: t.s.a = 924\times 28$

$\sf \implies \: t.s.a = \: {25872cm}^{2}$