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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?

Seven Sticks

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

Three Fingers and a Loop of String

Using a loop of string stretched around three of your fingers, what different triangles can you make? Draw them and sort them into groups.

Triangle or No Triangle?

Age 5 to 7
Challenge Level

You could print off this sheet of the shapes, then cut them out and look at one shape at a time. Try turning the shape round so that it is a different way up.

Think about what you know about triangles - do you think this shape is a triangle? Why? Why not? Explain your ideas to someone else and see if they agree!
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.
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NRICH is part of the family of activities in the Millennium Mathematics Project.