Trigonometry is one of the most ancient subjects studied by scholars all over the world. It was invented because its need arose in astronomy. Some real life applications of trigonometry are:
1) To calculate distances from the Earth to the planets and stars.
2) Trigonometry is used in geography and in navigation.
3) The knowledge of trigonometry is used to construct maps, to determine the position of an island in relation to the longitudes and latitudes.
4) To calculate height of buildings, towers and monuments.