Question

Find the perimeter of 6 regular octagons linked together side by side,if one side is 4.5 inches. 


Answer 1

Check the picture below.

also notice, the octagons on either edge, include 7 sides to the perimeter, whilst the octagons in between, only include 6 sides to the perimeter.

so, add all sides, excluding those borders, and that's the perimeter.

Answer 2

Six regular octagon arranged side to side is shown in the diagram below.

The shape has 38 equal sides, each side is 4.5 inches, so the perimeter is

4.5 × 38 = 171 inches