G1a – 2D geometry – terms and notation

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 Names of polygons

 Drag the slider across to see the names of polygons with up to 13 sides.

 See G4a – Properties of special triangles and quadrilaterals for more on particular types of triangles and quadrilaterals.

2D geometry – terms and notation

This lesson covers the following key words: edge, vertex, equal edges and angles, and parallel.

The definitions of acute, right, obtuse and reflex angles are covered in lesson G15a.

Teacher resources

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  • Slides in PPTX (with click-to-reveal answers)
  • Slides in PDF (one slide per page, suitable for importing into IWB software)
Links to past exam questions

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Vocabulary note

What links the words vertigo and vertex? They both come from the Latin verb vertere meaning to turn.

In the real world

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