When investigating primary geometry, students are commonly only presented with ‘traditional’ shapes. This limits their understanding of the properties of these shapes.
Shapes should be presented in varying orientations. Additionally, a variety of shape examples should be used. Young students need to see that not all triangles are equilateral. By seeing a range of shapes, they learn to recognize the properties of all triangles, not just equilateral triangles.
When comparing and sorting 2D shapes, a variety of non-standard shapes should be available. Commercial kits can be bought, but they can also be easily cut out of plastic or foamcore. Translucent binder covers from the dollar store are a good source of plastic, and they also work on the overhead.
|For example, many teaching resources and children’s books always show triangles like this:|