<human>:  I need help with understanding the definition of trigonometry.
<bot>: Trigonometry is a branch of mathematics dealing with the relationships between the sides and angles of triangles and the calculations based on them. It is specifically concerned with the relationships between angles and their sides, which can include triangles and other polygons. Trigonometric functions are usually used to calculate angles, distances, and shapes from given data. They can also be used to analyze the motion and interaction of particles and waves.