Henry Ernest Dudeney/Modern Puzzles/146 - The Cardboard Box/Solution

by : $146$

 * The Cardboard Box

Solution
The $11$ basic shapes are:


 * Dudeney-Modern-Puzzles-146-solution.png

All of these are asymmetrical except the first $2$ shapes.

Hence another $9$ can be flipped over to make a different shape.

So there are $20$ altogether.