9. Some applications of Trigonometry

This chapter shows how trigonometry is used in real-life situations to find heights and distances that cannot be measured directly. Students learn the concepts of angle of elevation and angle of depression, which occur when an observer looks upward or downward at an object. These angles help form right-angled triangles that can be solved using trigonometric ratios such as sin, cos, and tan.

 

Using these ideas, students can calculate the height of towers, buildings, trees, or mountains, and the distance between objects. These methods are widely used in fields such as surveying, navigation, engineering, architecture, and astronomy. This chapter helps students understand how mathematical concepts are applied to solve practical problems in everyday life.