Geometry & Algebra: Proving Triangle-Square

  • Context: High School 
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Discussion Overview

The discussion revolves around the geometric and algebraic proof of the claim that if a square fits exactly within a triangle, at least two sides of that triangle must be of equal length. The scope includes geometric reasoning and algebraic justification, with participants exploring various configurations and assumptions related to the problem.

Discussion Character

  • Exploratory
  • Debate/contested
  • Conceptual clarification

Main Points Raised

  • One participant asserts that if a square fits within a triangle, at least two sides of the triangle must be equal, seeking geometric and algebraic explanations.
  • Another participant questions the validity of the claim by presenting a counterexample, suggesting that the assertion may not hold in all cases.
  • Some participants propose that the conditions of the problem may specify that the square aligns with the midpoint of one of the triangle's sides, which could support the claim.
  • A clarification is made that only one side of the square should touch a side of the triangle, while the other two sides touch one of the square's corners, which raises further questions about the configuration.
  • There is uncertainty about the implications of different configurations and whether they lead to two sides of the triangle being equal.

Areas of Agreement / Disagreement

Participants express differing views on the validity of the original claim, with some supporting it under specific conditions while others present counterexamples that challenge its universality. The discussion remains unresolved, with no consensus reached.

Contextual Notes

Participants note that the problem's conditions are not fully defined, leading to ambiguity in interpretations of how the square fits within the triangle. There are also unresolved questions about the geometric configurations that could affect the validity of the claim.

adjacent
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As you see in the attachment if a square exactly fits in a triangle of any shape,Then atleast Two sides of that triangle would be of equal length(Upper two sides as in attachment)

Explain this Geometrically and algebraically

I tried it but in vain(Im a 9th grader)
 

Attachments

  • Square-Triangle.png
    Square-Triangle.png
    1.7 KB · Views: 513
Last edited:
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Is this a homework question? And if not, an you show us or explain to us what you tried?
 
I'm not convinced that this is true. Why doesn't my counterexample work?
 

Attachments

  • counterexample.png
    counterexample.png
    1,023 bytes · Views: 508
adjacent said:
As you see in the attachment if a square exactly fits in a triangle of any shape,Then atleast Two sides of that triangle would be of equal length(Upper two sides as in attachment)

Explain this Geometrically and algebraically

I tried it but in vain(Im a 9th grader)

Well, see, here's the thing. When you CHOOSE a triangle that has two equal sides, you do indeed get a triangle with 2 equal sides. So what? What about Number Nine's example?
 
My bet is that part of the assignment details that the square has to line up with the midpoint of one of the sides. Then (I think) it would be true.
 
Vorde said:
My bet is that part of the assignment details that the square has to line up with the midpoint of one of the sides. Then (I think) it would be true.

It would almost certainly be true in that case. I would accept a handwavy proof by symmetry.
 
sorry!Only one side of the square should touch a side of the triangle.The other two sides should touch one of the corners of the square.Then this will be correct.This is no homework,I am just curious.I could not find any explanation.
 
adjacent said:
sorry!Only one side of the square should touch a side of the triangle.The other two sides should touch one of the corners of the square.Then this will be correct.This is no homework,I am just curious.I could not find any explanation.

What do you mean "touch a side"? It's not clear what configuration you mean. Draw an example
 
adjacent said:
sorry!Only one side of the square should touch a side of the triangle.The other two sides should touch one of the corners of the square.Then this will be correct.This is no homework,I am just curious.I could not find any explanation.

I'm still not convinced. You could still have a situation like the one illustrated in my picture (attached), and I'm not sure that 2 sides would necessarily be the same length.
 

Attachments

  • counterexample.png
    counterexample.png
    1.2 KB · Views: 518
  • #10
You are right Number nine,Thanks!
 

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