Three's company

In the QCA glossary a triangle is a polygon with three sides. A polygon (introduced in year 4) is a closed plane figure bounded by straight lines. A simpler explantion for younger children could be "A triangle is a flat shape with three sides".

Useful activities

* Demonstrate a wide range of triangles in different sizes and orientations. Ask: "Is this a triangle? How do you know it is a triangle?"

* Encourage children to feel for triangles by touch using a feely box or bag

* Make word links. A triangle has three sides and three angles, as the musical instrument with the same name has. A tricycle has three wheels.

* Use the children themselves. Give a rope of old tights to a group of three children. Ask them to move around to make different triangles.

* Use fantasy. How would it be to live in a world of triangles?

* Use construction kits. What shapes can be made using triangles?

* Provide triangular grid paper - children colour larger and larger triangles.

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