How to Find Angle of Depression

To find the Angle of Depression for any given condition, we construct a right-angle triangle by drawing perpendicular, and in that right-angle triangle one of the angles is the angle of depression. To find the angle of depression we use the given sides of the triangle and trigonometric ratios and the following steps.

Step 1: Observe the given sides of the triangle.

Step 2: If the perpendicular and hypotenuse of the triangle are given then we use the trigonometric ratio sin.

Step 3: If the base and hypotenuse of the triangle are given then we use the trigonometric ratio cos.

Step 4: If the base and perpendicular of the triangle are given then we use the trigonometric ratio tan.

Step 5: Now, calculate the angle of depression using one of the appropriate formulas as given below:

  • θ = sin-1(p/h)
  • θ = cos-1(b/h)
  • θ = tan-1(p/b)

Therefore, the resultant value will give the angle of depression.

Angle of Depression

Angle of Depression is one of the two important angles in Trigonometry, the other being the angle of elevation. The angle of depression refers to the angle at which one must look downward from a horizontal position to view an object situated at a lower level. It’s defined by the direct line from the observer to the object being observed, indicating a downward inclination of the line of sight.

In this article, we will learn about the Angle of Depression including various examples of the angle of depression and key differences between the angle of elevation and the angle of depression. We will also learn, how to calculate the angle of depression.

Table of Content

  • What is Angle of Depression in Trigonometry?
    • Angle of Depression Definition
    • Terms Related to Angle of Depression
  • Angle of Depression Examples
  • Angle of Depression Formula
  • How to Find Angle of Depression
  • Angle of Depression and Elevation
  • Solved Examples of Angle of Depression
    • Class 10 Resources on Angle of Depression
  • Practice Problems on Angle of Depression
  • FAQs on Angle of Depression

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What is Angle of Depression in Trigonometry?

In trigonometry, the angle of depression is referred to as the angle, formed between the horizontal line and the line of sight of the observer when the observer is placed over the object. In other words, an angle of depression is formed when the object is at the bottom and the observer is at the top and the measure of it can be affected by changing the various height and distances between the observer and object....

Angle of Depression Examples

Some of the most common examples of the angle of depression in daily life are:...

Angle of Depression Formula

As we can see in the following illustration, the horizontal line, line of sight, and the perpendicular drawn from the object to the horizontal line form a right-angled triangle....

How to Find Angle of Depression

To find the Angle of Depression for any given condition, we construct a right-angle triangle by drawing perpendicular, and in that right-angle triangle one of the angles is the angle of depression. To find the angle of depression we use the given sides of the triangle and trigonometric ratios and the following steps....

Angle of Depression and Elevation

The angle of depression is the angle formed between the horizontal line and the line of sight of the observer when the object is at the bottom. The angle of elevation is the angle formed between the horizontal line and the line of sight of the observer when the object is at the top. Both angle of depression and the angle of elevation are opposites of each other and the difference between the angle of elevation and the angle of depression is given as follows:...

Solved Examples of Angle of Depression

Problem 1: Find the angle of depression given the base and perpendicular of the 4 cm and 5 cm respectively....

Practice Problems on Angle of Depression

Problem 1: From the top of a 100-meter tall building, an observer sees a car on the ground. The angle of depression to the car is 30 degrees. How far is the car from the base of the building?...

FAQs on Angle of Depression

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