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The slant height of a frustum of a cone is 5 \(cm\) and the radii of its ends are 4 \(cm\) and 1 \(cm\). Find its curved surface area.
 
Answer:
 
The curved surface area of a frustum of a cone \(=\)  \(cm^2\)
  
[Note: Enter the answer upto two decimal places.]