Question

Find the volume , lateral surface area and total surface area. of each of the cylinders whose dimensions are radius of the base 21 cm height 4 cm​

Answer 1

Question:

Find the volume , lateral surface area and total surface area. of each of the cylinders whose dimensions are radius of the base 21 cm height 4 cm.

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Given :

• Radius of base of cylinder = 21 cm
• Height of cylinder = 4cm

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To find :

• Volume of cylinder
• Lateral surface area of cylinder
• Total surface area of cylinder

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Solution :

(i) Volume of cylinder :- πr²h

ㅤㅤㅤㅤㅤ= 22/7 × 21 × 21 × 4

ㅤㅤㅤㅤㅤ= 5538.96 cm³

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(ii) Lateral surface area of cylinder = 2πrh

ㅤㅤㅤㅤㅤ= 2 × 22/7 × 21 × 4

ㅤㅤㅤㅤㅤ= 528 cm²

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(iii) T.S.A of cylinder = 2πr(r+h)

ㅤㅤㅤㅤㅤ= 2 × 22/7 × 21 (21 +4)

ㅤㅤㅤㅤㅤ= 3300 cm²

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Answer 2

Answer:

Volume of the cylinder :

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

=22/7 ×21 × 21 ×4

= 5544 cm³

Surface area of the cylinder:

$2\pi \:rh$

=2×22/7×21×4

=528 cm²

Total surface area of cylinder:

$2\pi \: r(r + h)$

=2×22/7 × 21 (21+4)

=2 × 22/7 × 21 × 25

=3300 cm³

HERE'S YOUR ANSWER!!!

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