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It is Required to Make a Closed Cylindrical Tank of Height 1 M and Base Diameter 140 Cm from a Metal Sheet. How Many Square Meters of the Sheet Are Required for the Same? - CBSE Class 9 - Mathematics

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Question

It is required to make a closed cylindrical tank of height 1 m and base diameter 140 cm from a metal sheet. How many square meters of the sheet are required for the same?

Solution

Height of the cylindrical tank (h)=1m.
Base radius of cylindrical tank (r) = `140/2`m =70 cm 

=0.7m
Area of sheet required – total surface area of tank = 2π (r+h)
=2×3.14×0.7 (0.7 +1) `m^2`

= 4.4×1.7`m^2`
=`7.48m^2`
∴So, it will required  `7.48m^2` of metal sheet.

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APPEARS IN

 RD Sharma Solution for Mathematics for Class 9 by R D Sharma (2018-19 Session) (2018 to Current)
Chapter 19: Surface Areas and Volume of a Circular Cylinder
Ex.19.10 | Q: 4 | Page no. 8
Solution It is Required to Make a Closed Cylindrical Tank of Height 1 M and Base Diameter 140 Cm from a Metal Sheet. How Many Square Meters of the Sheet Are Required for the Same? Concept: Surface Area of a Right Circular Cylinder.
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