How do you classify shapes by geometric properties?

Shapes can be classified by geometric properties such as the number of sides, angles, and symmetry. For example, polygons are categorized based on their side count, with triangles, quadrilaterals, and pentagons being common types. Additionally, shapes can be classified as regular or irregular based on the equality of their sides and angles. Other properties, such as convexity and concavity, further refine these classifications.