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Length + width = 18 cm so length = 12 cm and width = 6 cm. Presumably the length is the common side so the perimeter of the octagon is 8 x 12 = 96 cm. If the width is the common side then the perimeter of the octagon is 8 x 6 = 48 cm

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Q: A rectangle and a regular octagon share a common side If the length of the rectangle is twice its width and the perimeter is 36 cm what is the perimeter of the octagon?
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