Trigonometry (noun)

The branch of mathematics concerned with the relationships between the sides and angles of triangles and the calculations based on them.

Origin:

Late 16th century: from greek trigōnon "triangle" + -metron "measure".

Examples:

1. Trigonometry is an important tool in surveying, engineering, and navigation.
2. Trigonometry is used to calculate distances and angles, and to solve problems involving triangles.
3. Trigonometry was first developed by the ancient Greeks, and has been used for thousands of years in a variety of applications.
4. Trigonometry is a fundamental part of mathematics, and is studied by students in schools and universities around the world.
5. Trigonometry has a wide range of applications, including the calculation of astronomical distances, the design of buildings and bridges, and the analysis of waves and signals.