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# Math Monday: Four Paper Triangles

By George Hart for the Museum of Mathematics

What could sound easier than to make a regular construction from four paper equilateral triangles? One possible construction is the regular tetrahedron, which is pretty easy. Here is a different construction from four equilateral triangles. Each triangle is linked with the other three, like two links of a chain.

Use this template, in which each triangle has a hole cut from it, with exactly half the edge length. You’ll need to cut through three of them to link them together. After you assemble them properly, you can tape the cut back together.

Cory Poole took this idea and miniaturized it, making a lovely pair of geometric earrings from paper painted with metallic paint.

Instructions for assembling the triangles are available here, along with other polygon assembly challenges.

More:
See all of George Hart’s Math Monday columns

## 10 thoughts on “Math Monday: Four Paper Triangles”

1. Francesco Mancini says:
2. Cory Poole says:

The origami and pencil ones in the comment are really cool.  I’m also commenting because I’m Cory (not Corey  :)  )  Poole.

1. Gareth Branwyn says:

Sorry about that Corey… er… Cory. Fixed!

1. Cory Poole says:

Hah!  It’s ok.  I’m used to it.

3. hurlebaus says:

Print twice, than make the cut on each set on a different place, mount together and glue than!

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### Gareth Branwyn

Gareth Branwyn is a freelance writer and the former Editorial Director of Maker Media. He is the author or editor of over a dozen books on technology, DIY, and geek culture. He is currently a contributor to Boing Boing, Wink Books, and Wink Fun. And he has a new best-of writing collection and “lazy man’s memoir,” called Borg Like Me.

View more articles by Gareth Branwyn

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