Q1
What is the angle of elevation?
AAngle looking upward from horizontal
BAngle looking downward from horizontal
CA type of triangle
DA fixed 90° angle always
ICSEClass 10 (ICSE)MathematicsCh 22 · Topic 1
Heights and Distances
Trigonometry helps calculate heights and distances indirectly, using angles of elevation and depression along with known distances.
Core concept
The angle of elevation is the angle looking upward from a horizontal line to an object, used to calculate heights of tall structures.
How it works
The angle of depression is the angle looking downward from a horizontal line, used when observing objects below eye level.
Why it matters
Using trigonometric ratios (usually tangent) with a known distance and angle, we can calculate unknown heights or distances.
Key detail
This application of trigonometry is widely used in surveying, navigation, architecture, and various real-world measurement scenarios.
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• Angle of elevation: looking upward from horizontal.
• Used to calculate heights of tall structures.
• Angle of depression: looking downward from horizontal.
• Used for objects below eye level.
• Tangent ratio commonly used with known distance and angle.
• This calculates unknown heights or distances.
• Applications: surveying, navigation, architecture.
• This is a practical trigonometry application.