The perimeter of a regular octagon, with each side measuring 15 cm will be:
120 cm
Given, length of the side of the octagon = 15 cm
Perimeter = sum of all sides
Since it is a regular octagon, so the figure will have 8 sides and all sides will be equal.
∴ Perimeter = 8 x length of a side
= 8 x 15 cm
= 120 cm