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How many sides does a regular octagon have?

  1. 6

  2. 7

  3. 8

  4. 9

The correct answer is: 8

A regular octagon has 8 sides because the prefix "oct" means 8. Therefore, a regular octagon will always have 8 sides. The other options, 6, 7, and 9, do not have the prefix "oct" and do not match the correct number of sides for a regular octagon.