# Application of trigonometric ratio

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## 09 APPLICATION OF TRIGONOMETRIC RATIO

Line of Sight: it is the line joining eye of observer to the point in the object.

The angle of Elevation: It is angle made by line of sight with the horizontal

when object viewed is above the horizontal.

The angle of depression:It is angle made by line of sight with the horizontal

when object viewed is below the horizontal.

E.g.: A peacock seesa cloud at the angle of $\text{30°}$. The cloud is at certain height from the ground. If the horizontal distance from peacock to the point from where the height of cloud is measured is $\text{100}$ m.Find the height of cloud.

Suppose cloud

peacock

is point from where the height of cloud is measured.

BC m

To find: $\text{AB}$.