Ever wondered how people measured the heights of big things before the "measure" tool on phones? This is how. They had to look up tangents of angles in a book listing all of them, but luckily we have calculators.
An angle of elevation is the angle formed between the horizontal line of sight and a line of sight pointing upwards towards an object. It is measured from the horizontal to the line of sight.
A person standing 20 meters away from a building looks up at the top of the building with an angle of elevation of 30°. To find the height of the building, we can use the tangent function:
$\tan(30°) = \frac{\text{opposite}}{\text{adjacent}} = \frac{\text{height}}{20}$
$\text{height} = 20 \tan(30^\circ) \approx 11.55\ \text{m}$.
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