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Problem

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Textbook Expert
Textbook ExpertVerified Tutor
12 Nov 2021

Given information

A cylindrical can without a top is made to contain  of liquid.

Step-by-step explanation

Step 1.

The area of the triangle is given by  . We can write in terms of and

   

 

Now, the area can be written as

 

Geometrically, is defined only when is in . At the end point the triangle degenerates into a line.

Differentiating we get

 

 

 

Setting  to zero gives

 

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