Question

In the following figure, what are the angles of depression from the observing position O₁ and O₂of the object at A?

Answer 1

In a triangle, `o<sub>1</sub> AC`

`⇒ ∠ A=180°-(90°+60°)` 

`⇒ ∠ A=180°-150°`          We know that `[ ∠A+ ∠B ∠C=180 °]`

`⇒ ∠ A=30°` ' 

Again,

In a triangle `o<sub>2</sub> AB,` 

⇒  `∠ o_2=180°-(90°+45°)` 

⇒`∠ o_2=180°-135°` 

⇒ `∠ o_2=45°`

Hence the required angles are` 30° 45°`.