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Polygons
O-Level E Math
For All Polygons
$$\text{Sum of interior angles} = (n-2) \times 180^\circ$$
$$\text{Sum of exterior angles} = 360^\circ$$
For Regular Polygons
$$1 \text{ interior angle} = \dfrac{(n-2) \times 180^\circ}{n}$$
$$1 \text{ exterior angle} = \dfrac{360^\circ}{n}$$
Formulas for the Singapore O-Level Elementary Mathematics syllabus