Picture of How to make an equilateral triangle from a square
Triangles are the strongest shapes in the world, due to the fact that with 3 lengths of sides, only one triangle can be made. This Instructable will teach you how to make a paper equilateral triangle out of a square without any tools. I was taught how to do this a while back but I have not seen any Instructables on how to do this.

Step 1: Start with a square.

Picture of Start with a square.

  • A piece of square paper


  • Scissors (optional)
  • Pencil (optional)
  • Tongue (If you do not have scissors)

Yes, all you really need are your hands, a square piece of paper, and your tongue.
icyflame4 years ago
In my math proofs class, we had to write up a proof for this and then find the folding pattern to make the largest equilateral triangle and then prove that too haha. Very cool :)
greenjedi6 years ago
i thought arches were the strongest shape
n8man (author)  greenjedi6 years ago
Nope, triangles are, why do you think that bridges have triangle shapes.
Because they're easier to build than arches.
surely a single point would be stronger than a triangle
REA6 years ago
i thought you were making a penrose triangle. =( lol
lieuwe6 years ago
wow, sort of useful, i guess
rimar20006 years ago