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Find the Curved Surface Area of a Cone, If Its Slant Height is 60 Cm and the Radius of Its Base Is 21 Cm. - Mathematics

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Question

Find the curved surface area of a cone, if its slant height is 60 cm and the radius of its base is 21 cm.  

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Solution

Given that
Radius of its base is 21cm
Slant height= 60cm  

WKT, Curved surface area of a cone =`pirl` 

∴ Curved surface area=`22/7xx21xx60` 

=`3960cm^2` 

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Chapter 20: Surface Areas and Volume of A Right Circular Cone - Exercise 20.1 [Page 7]

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RD Sharma Mathematics [English] Class 9
Chapter 20 Surface Areas and Volume of A Right Circular Cone
Exercise 20.1 | Q 1 | Page 7
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