The term for a 10-sided polygon is a decagon. Decagons can be regular, with all sides and angles equal, or irregular, with varying lengths and angles. In geometry, the internal angles of a decagon add up to 1,440 degrees, and each internal angle in a regular decagon measures 144 degrees. Decagons are often used in various fields such as architecture, design, and art, showcasing their intricate symmetry and aesthetic appeal. The study of polygons, including decagons, is fundamental in mathematics, contributing to our understanding of shapes, their properties, and their applications in the physical world.