Differential Calculus Application

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Discussion Overview

The discussion revolves around the application of differential calculus to solve an optimization problem related to maximizing the area of a field that a farmer can enclose with a fixed length of fencing. The scope includes theoretical aspects of calculus, specifically focusing on optimization techniques and potential assumptions regarding the shape of the field.

Discussion Character

  • Exploratory, Technical explanation, Debate/contested, Mathematical reasoning

Main Points Raised

  • One participant asks for help in applying differential calculus to determine the dimensions of a field that maximizes area with a 100-meter fence.
  • Another participant suggests that calculus of variations may be relevant if the field can take any shape, noting that a circle would provide the maximum area for a given perimeter.
  • It is proposed that if the field is assumed to be rectangular, the relationship between length and width can be expressed with the equation 2x + 2y = 100, leading to an area function A = xy.
  • A later reply questions the assumption of flat ground, implying that terrain may affect the outcome.
  • Another participant emphasizes that the solution depends on land ownership and the shape of the land, suggesting that practical constraints may complicate the problem.
  • One participant identifies the problem as an optimization problem and recommends using derivatives to find maximum and minimum values.

Areas of Agreement / Disagreement

Participants express differing views on the assumptions regarding the shape of the field and the implications of land ownership, indicating that multiple competing perspectives remain without consensus on how to approach the problem.

Contextual Notes

Assumptions about the shape of the field (rectangular vs. circular) and external factors such as land ownership and terrain are not resolved, which may affect the applicability of the proposed methods.

kurimaw
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Just a question regarding Differential Calculus Application. Can anyone help me to solve this using differential calculus. Here it is:

A farmer has enough money to build only 100 meters of fence. What are the dimensions of the field he can enclose the maximum area?

thanks in advanced:D
 
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Have you done calculus of variations yet?
 
Calculus of variations would be needed if you assume the field can be of any shape (a circle give maximum area for a given perimeter). You may be allowed to assume the field is a rectangle. In that case, letting x and y be the length and width, you know that 2x+ 2y= 100 and that the area is A= xy. Solve 2x+ 2y= 100 for either x and y and put that into A= xy to get the function in a single variable. Do you know what to do from there?

(The answer is pretty obvious anyway!).
 
HallsofIvy said:
(The answer is pretty obvious anyway!).

At least as long as the ground is flat... :smile:
 
it depends who owns the land, and what shape his own land has. our friend used the method described and the fence wound up on someone else's land!
 
This is an optimization problem. Use derivatives to find it. It was the section where you learned how to find the max and mins of a graph.
 

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