The document discusses shapes that can be folded in half along a line of symmetry. A square is used as an example of a shape that can be divided into two equal parts when folded along its diagonal broken line. This makes the square a symmetrical figure. Another figure shown cannot be divided into equal parts when folded along a line, making it an asymmetrical figure. Lines of symmetry and whether a shape can be divided into two equal parts when folded determine if it is symmetrical or asymmetrical.