Checking and securing understanding of exterior angles
I can find the exterior angle of any regular polygon or deduce the exterior angle of an irregular polygon.
Checking and securing understanding of exterior angles
I can find the exterior angle of any regular polygon or deduce the exterior angle of an irregular polygon.
These resources will be removed by end of Summer Term 2025.
Lesson details
Key learning points
- The sum of the exterior angles of a polygon can be demonstrated using a point.
- The sum of the exterior angles of a polygon can be proven using interior angles and the angles on a straight line.
- An exterior and interior angles pair are supplementary.
Keywords
Polygon - A polygon is a flat (2D), closed figure made up of straight line segments.
Regular - A regular polygon has sides that are all equal and interior (inside) angles that are all equal.
Interior angle - An interior angle is an angle formed inside a polygon by two of its edges.
Exterior angle - An exterior angle is an angle on the outside of a polygon between an extension of an edge and the adjacent edge.
Common misconception
An exterior angle is equal to 360° - the size of the interior angle because angles around a point sum to 360°.
An exterior angle is an angle on the outside of a polygon between an extension of an edge and the adjacent edge.
To help you plan your year 10 maths lesson on: Checking and securing understanding of exterior angles, download all teaching resources for free and adapt to suit your pupils' needs...
To help you plan your year 10 maths lesson on: Checking and securing understanding of exterior angles, download all teaching resources for free and adapt to suit your pupils' needs.
The starter quiz will activate and check your pupils' prior knowledge, with versions available both with and without answers in PDF format.
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The assessment exit quiz will test your pupils' understanding of the key learning points.
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Explore more key stage 4 maths lessons from the Angles unit, dive into the full secondary maths curriculum, or learn more about lesson planning.
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