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Problem

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Textbook Expert
Textbook ExpertVerified Tutor
15 Nov 2021

Given information

A cup which is made from a circular piece of paper of radius  by cutting out a sector and joining the edge  and .

 

Step-by-step explanation

Step 1.

The radius of the cone shaped drinking cup is and the height is  .

In the figure, in tringle by Pythagoras theorem, 

  

    

Volume   

Substitute the value of   in   

  

  

Differentiate  with respect to   

  

For critical points,

  

    

    

  

Since the height cannot be negative, reject  

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