This document discusses basic 2-d shapes and their defining characteristics. It lists that a triangle has 3 sides, a rectangle has 4 sides, a square also has 4 sides, a pentagon has 5 sides, a hexagon has 6 sides, and an octagon has 8 sides. The shapes mentioned include triangle, rectangle, square, pentagon, hexagon, and octagon.

1. 2-d shapes

2. triangle 3 sides

3. rectangle 4 sides

4. square 4 sides

5. pentagon 5 sides

6. hexagon 6 sides

7. hexagon 6 sides

8. octagon 8 sides

9. square rectangle triangle pentagon hexagon octagon