Journal of the Mathematics Council of the Alberta Teachers’ Association
Volume 33 Issue 3, December 1996
33 – 34
Daniel Robbins, Sudhakar Sivapalan, and Matthew Wong
A red triangular cardboard is lying on a desk. We wish to get a physical copy of its mirror image. The simplest way is to flip the cardboard over. However, we discover that it is plain on the other side, and we want a red copy of the mirror image We are allowed to use straight cuts to dissect the triangle into pieces for reassembly. The problem is to minimize the number of pieces.
