Exterior angles are angles formed on the outside of a polygon when you extend one of its sides. For example, in a hexagon, if you extend a side, the angle created between the extended line and the next side of the hexagon is called an exterior angle. Exterior angles have a special property where, if you add up one exterior angle from each vertex of a polygon, the total will always be 360 degrees, no matter how many sides the shape has. This rule can help you understand and solve problems involving polygons and their angles in your maths GCSE course.
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