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