Optimization problem: Folding a triangle to minimize one side

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SUMMARY

The optimization problem involves folding a 12-inch by 8-inch piece of paper to minimize the length of the fold. The key variables are defined as x, the distance from the top edge to the fold point, and y, the length of the fold. To establish a relationship between x and y, one must utilize the dimensions of the paper and the properties of the triangles formed by the fold. The solution requires differentiation to find the minimum value of y in relation to x.

PREREQUISITES
  • Understanding of basic geometry, specifically triangle properties
  • Knowledge of calculus, particularly differentiation techniques
  • Familiarity with optimization problems in mathematics
  • Ability to set up equations based on geometric relationships
NEXT STEPS
  • Study the properties of similar triangles to relate x and y
  • Learn differentiation techniques for finding minima in calculus
  • Explore optimization strategies in geometric contexts
  • Review examples of real-world applications of folding problems
USEFUL FOR

Students and educators in mathematics, particularly those focused on geometry and calculus, as well as anyone interested in practical applications of optimization techniques.

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Homework Statement



The upper right-hand corner of a piece of paper, 12 in by 8 in is folded over to the bottom edge. How would you fold it to minimize the length of the fold? In other words, how would you choose x to minimize y?

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Homework Equations



None so far.

The Attempt at a Solution



I haven't a clue how to get started. I know I need to relate the length of y to the length of x and then differentiate and find the minima, but I don't know how to form the initial relationship.
 
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Hint -- use the 8x12" information as part of the equations your write. If x is as shown, then the bottom piece is 8-x, right? What can you say about the angles in the two triangles that are formed by that fold?
 

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