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Question: What is an Octagon ?

Answer:

Octa means eight. An octagon is an 8-sided polygon. A regular octagon has all its sides of equal length and all its angles equal to 135o.

A regular octagon is an octagon which has all same length sides and whose internal angles are all the same size. The internal angle at each vertex of a regular octagon is 135o and the sum of all the internal angles is 1080o.