GCSE Maths (Edexcel)
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Geometry and Measures
Properties and Constructions
Exterior Angles Around a Polygon
3:48
Angles in Shapes
Spec
G6
- Exterior angles of a polygon are angles outside the polygon found by extending the edge of the polygon
- The interior angle plus the exterior angle of a vertex add up to 180 degrees
- To calculate the exterior angle given the interior angle, subtract the interior angle from 180 degrees
- The exterior angles of any polygon add up to 360 degrees
- To calculate a missing exterior angle, use the equation: sum of known exterior angles + missing angle = 360 degrees
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