Each interior angle of a regular octagon measures:

Each interior angle of a regular octagon measures:
  1. $120^{\circ}$
  2. $135^{\circ}$
  3. $140^{\circ}$
  4. $144^{\circ}$

Solution

Each interior angle $= \dfrac{(8-2) \times 180^{\circ}}{8} = \dfrac{1080^{\circ}}{8} = 135^{\circ}$.

Asked in: IMO

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