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<ol class="num-list"><li><div class="list-item-content"><span class="list-item-text">When viewing a higher object from below (by the cat), the acute angle formed by a horizontal eye-level and the line of sight is called the <strong>angle of elevation</strong>.</span></div></li><li><div class="list-item-content"><span class="list-item-text">When viewing a lower object from above (by the boy), the acute angle formed by a horizontal eye-level and the line of sight is called the <strong>angle of depression</strong>.</span></div></li><li><div class="list-item-content"><span class="list-item-text">As the horizontal lines are parallel, the value of the angle of elevation is the same as the angle of depression (using alternate angle property).</span></div></li><li><div class="list-item-content"><span class="list-item-text">It is always useful to make a sketch of the diagram to determine the position of the objects and the correct angle of elevation and depression.</span></div></li><li><div class="list-item-content"><span class="list-item-text">Key concepts needed for right-angled triangles: Trigonometric ratios such as \(TOA\), \(CAH\), \(SOH\) and the Pythagoras' Theorem.</span></div></li></ol>

When viewing a higher object from below (by the cat), the acute angle formed by a horizontal eye-level and the line of sight is called the **angle of elevation**.

When viewing a lower object from above (by the boy), the acute angle formed by a horizontal eye-level and the line of sight is called the **angle of depression**.

As the horizontal lines are parallel, the value of the angle of elevation is the same as the angle of depression (using alternate angle property).

It is always useful to make a sketch of the diagram to determine the position of the objects and the correct angle of elevation and depression.

Key concepts needed for right-angled triangles: Trigonometric ratios such as \(TOA\), \(CAH\), \(SOH\) and the Pythagoras' Theorem.

Angles of Elevation and Depression

Angles of Elevation and Depression

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