Angles in polygons (Edexcel GCSE Maths): Flashcards

Angles inside a polygon

Angles formed when extending a side outward

$180°$ (they form a straight line)

$180° \times (n - 2)$

$360°$ (always)

All sides equal length, all angles equal size

$\frac{360°}{n}$

$180° - \text{exterior angle}$

$72°$

$60°$

$45°$

$n = \frac{360°}{\text{exterior angle}}$