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# Is there a way to cut up an equilateral triangle and reorganize the parts to get a square of the same surface area?

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Is there a way to cut up an equilateral triangle and reorganize the parts to get a square of the same surface area?

Guest Mar 25, 2015

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This is known as Haberdasher's Problem.  A web search will get you the solution.

A search on Mathematical Disections gets further more general info.

Bertie  Mar 26, 2015
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Well there is of course but working out the best cuts would take more time than i have right now.

If you let the side lengths of the equilateral triangle be 2 units then the height will be $$\sqrt3$$  units.

You can multiply these by any constant if you want different side lengths.

The area of the triangle will be      $$A=(1/2)*b*h = 0.5*2*\sqrt3 = \sqrt3$$

The are of a square is    $$l*l$$  so

$$\\l*l=\sqrt3\\ l^2=3^{1/2}\\ l=3^{1/4}\qquador if you prefer  l=\sqrt[4]{3}\;\; units$$

so if the side of the triangle is 2k units then the side of the square will be   $$\sqrt[4]{3}\times k\;\; units$$

Melody  Mar 26, 2015
#2
+890
+5

This is known as Haberdasher's Problem.  A web search will get you the solution.

A search on Mathematical Disections gets further more general info.

Bertie  Mar 26, 2015
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Thanks Bertie :)

Melody  Mar 27, 2015