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Prerequisites

- G3a – Angles at a point, angles at a point on a straight line, vertically opposite angles
- G3b – Alternate and corresponding angles on parallel lines
- Knowledge of the definition of “regular” is also assumed

# Part 1 – The sum of angles in a triangle

Teacher resources for Part 1

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Links to past exam questions

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# Part 2 – Angle properties of polygons

Teacher resources for Part 2

Links to past exam and UKMT questions

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In the real world

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Check out this article on geodesic domes from the Buckminster Fuller Institute for more – and note the equilateral triangles making up the dome in the article’s main image.