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Let's Investigate Triangles

Vincent and Tara are making triangles with the class construction set. They have a pile of strips of different lengths. How many different triangles can they make?

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Seven Sticks

Explore the triangles that can be made with seven sticks of the same length.

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Triangle Edges

How many triangles can you make using sticks that are 3cm, 4cm and 5cm long?

Three Fingers and a Loop of String

Stage: 1 Challenge Level: Challenge Level:1

There are lots of answers to this question, depending on how you arrange the groups.

Have a try for yourself, and if you discover anything interesting, let us know ! Please do send us some pictures or photos of the triangles you make.
The NRICH Project aims to enrich the mathematical experiences of all learners. To support this aim, members of the NRICH team work in a wide range of capacities, including providing professional development for teachers wishing to embed rich mathematical tasks into everyday classroom practice. More information on many of our other activities can be found here.
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NRICH is part of the family of activities in the Millennium Mathematics Project.