Final answer:
The perimeter of a regular octagon and decagon is calculated based on the number of sides and their lengths.
Explanation:
The formula to calculate the perimeter of a regular octagon is determined by multiplying the side length by 8, as an octagon has 8 equal sides.
For a regular decagon, the perimeter can be calculated by multiplying the side length by 10, as a decagon has 10 equal sides.
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