Question

find out the area of metal sheet needed to make a closed cylinder of radius 4.2 cm and height 6 cm also find out volume
of the cylinder .​

Answer 1

Step-by-step explanation:

sheet required:-2πrh

2*22/7*4.2*6

$2 \times 22 \div 7 \times 4.2 \times 6$

$2 \times 22 \times .6 \times 6$

$158.4 \: it \: would \: be \:the \: length \: of \: sheet \: required$

volme:-

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

$22 \div 7 \times 4.2 \times 4.2 \times 6$

326.4 would be volume

Answer 2

Given :  a closed cylinder of radius 4.2cm and height 6cm  

To find : the area of metal sheet needed to make a closed cylinder

volume of the cylinder​

Solution:

r = 4.2 cm

h = 6 cm

area of metal sheet needed to make a closed cylinder = Total Surface area of cylinder

Total Surface area of cylinder = 2πr² + 2πrh

= 2πr(r + h)

= 2 ( 22/7) * 4.2 ( 4.2 +  6)

= 26.4 ( 10.2)

= 269.28 cm²

area of metal sheet needed  = 269.28 cm²

Volume of cylinder =  πr²h

= (22/7) (4.2)²  * 6

= 332.64 cm³

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