Symmetry in shapes refers to a balanced and proportional arrangement of parts. A shape is considered symmetric if it can be divided into two identical halves that mirror each other. For example, a circle has infinite lines of symmetry, while a square has four. Symmetry can be found in nature, art, and architecture, making it an important concept in design. There are two main types of symmetry: reflective symmetry and rotational symmetry. Reflective symmetry occurs when one half of a shape is a mirror image of the other half. Rotational symmetry exists when a shape can be rotated around a central point and still look the same at certain angles.