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Solution for A Cylindrical Vessel, Without Lid, Has to Be Tin-coated on Its Both Sides. If the Radius of The Base is 70 Cm and Its Height is 1.4 M, Calculate the Cost of Tin-coating at the Rat - CBSE Class 9 - Mathematics

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Question

A cylindrical vessel, without lid, has to be tin-coated on its both sides. If the radius of the base is 70 cm and its height is 1.4 m, calculate the cost of tin-coating at the rate of Rs. 3.50
per 1000 cm2.

Solution

Given that 

r = 70cm, h =1.4m =140cm 

∴Area to be tin coated=`2(2pirh+pir^2)=2pir(2h+r)`

=`2xx22/7xx70(280+70)`  

`=154000cm^2` 

Required cost =`(154000xx3.50)/1000=Rs.539.` 

 

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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
Q: 9 | Page no. 8
Solution A Cylindrical Vessel, Without Lid, Has to Be Tin-coated on Its Both Sides. If the Radius of The Base is 70 Cm and Its Height is 1.4 M, Calculate the Cost of Tin-coating at the Rat Concept: Surface Area of a Right Circular Cylinder.
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