Trigonometry is a branch of mathematics that studies the relationships between the angles and sides of triangles, especially right triangles. It helps us understand how to calculate distances and heights using angles. The main functions in trigonometry are sine, cosine, and tangent, which relate the angles of a triangle to the lengths of its sides. In addition to triangles, trigonometry is widely used in various fields such as physics, engineering, and astronomy. For example, it helps engineers design structures and allows astronomers to calculate the distance to stars. Overall, trigonometry is a vital tool for solving real-world problems involving angles and distances.