The Smartest Triangles: Equilateral Triangles

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Discussion Overview

The discussion revolves around the concept of determining the "smartest" triangle based on a defined ratio of area to the square of the perimeter. Participants explore whether equilateral triangles yield the highest value of this ratio, using mathematical reasoning and optimization techniques.

Discussion Character

  • Exploratory, Technical explanation, Debate/contested

Main Points Raised

  • One participant defines the IQ of a triangle as the ratio of its area to the square of its perimeter, proposing that equilateral triangles are the smartest based on this definition.
  • Another participant applies Heron's formula and symmetry arguments, suggesting that using Lagrange multipliers leads to the conclusion that the sides of the triangle must be equal for maximum IQ, thus supporting the claim that equilateral triangles have the highest IQ.
  • Some participants express skepticism about the originality of the problem, suggesting it resembles a previous university-level problem of the week.
  • There are comments regarding the ethics of reusing problems, with one participant humorously implying that such practices might border on cheating.

Areas of Agreement / Disagreement

While there is a mathematical argument presented in favor of equilateral triangles being the smartest, the discussion includes skepticism about the originality of the problem and differing views on the implications of reusing problem statements.

Contextual Notes

The discussion does not resolve the ethical implications of problem reuse or the originality of the mathematical approach, leaving these points open to interpretation.

anemone
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Let the IQ of a triangle be the ratio $$\frac{\text{area of the triangle}}{(\text{perimeter of the triangle})^2}$$.

This is a dimensionless number. Show that the smartest triangles are equilateral triangles.
 
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Using Heron's formula, one notices by symmetry that interchanging any two of the variables representing the side lengths results in the same area and perimeter functions, hence Lagrange multipliers used with:

The objective function $$A(x,y,z)=\frac{\sqrt{s(s-x)(s-y)(s-z)}}{4s^2}$$ where $$s=\frac{x+y+z}{2}$$

Subject to the constraint $$g(x,y,z)=x+y+z-p=0$$

will necessarily lead to the implication:

$$x=y=z=\frac{p}{3}$$

Thus, the triangle having the greatest IQ is equilateral.
 
Hey MarkFL, this is the fastest solution that I have ever received so far!

View attachment 952

Great job!:cool:;)
 

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Let's just say this problem is nearly identical to a recent university level POTW...copy/paste/edit/done. (Rofl)
 
Looks to me these copy/paste/edit things are signs of you're on the verge of cheating...(Rofl)
 
anemone said:
Looks to me these copy/paste/edit things are signs of you're on the verge of cheating...(Rofl)

It's only cheating if I copy/paste the work of someone else...which I would never do of course. (Angel)
 

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