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Mathematics for IGCSE & O level - Pythagoras' Theorem And Trigonometry (Section 3 - No. 12)

The angle of elevation of a point B from point A is the angle between the horizontal plane and:
A line of sight below the horizontal plane
A line of sight above the horizontal plane
The vertical line
The distance AB

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The angle of elevation is the angle from the horizontal plane upwards to the line of sight.

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