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## Step 1: Start with a square.

- A piece of square paper

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

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.

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Materials:

- A piece of square paper

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

Now fold the bottom left corner so that it goes over the center fold. Make sure that the edge of the paper goes from the right bottom corner to the center crease. Pinch where the former bottom right corner meets the center line.

Make a fold that goes from where the pinch intersects the center to the bottom right hand corner, repeat on left side. These will become the two other sides of the triangle.

icyflame3 years agoReply

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 :)

greenjedi5 years agoReply

i thought arches were the strongest shape

n8man (author) 5 years agoReply

Nope, triangles are, why do you think that bridges have triangle shapes.

master blaster 4 years agoReply

Because they're easier to build than arches.

CybergothiChe 4 years agoReply

surely a single point would be stronger than a triangle

REA6 years agoReply

i thought you were making a penrose triangle. =( lol

lieuwe6 years agoReply

wow, sort of useful, i guess

rimar20006 years agoReply

Interesting.