Question

How many edges are there? (see comments)

Answer 1

I'm getting 24. If you fold the squares up, ignoring the octagons on each side, you count the lines dividing each square. There are 8 of these lines.

Now the octagons both have 8 edges, and they don't share any edges with each other, so we have 8+8 more edges for a total of 24.

Answer 2

Notice that we don't have to count the edges of the squares, because those edges are shared with the edges of the octagons, and we've already counted those.

Answer 3

Awesome. thank you

Answer 4

You're welcome.