The document provides instructions for creating isosceles triangles from a rectangular piece of paper. It has the following steps: 1. Fold a rectangular piece of paper in half and draw a line from the top of the fold to the bottom right corner, cutting along the line. 2. This creates three triangles, with one line of symmetry. 3. By folding along the line of symmetry, it proves that two of the sides of the triangle are equal, identifying it as an isosceles triangle. 4. The instructions then have the reader create another isosceles triangle from the remaining pieces of the original rectangle.