Ratios
A ratio is a comparison between two numbers of the same kind. It represents how many times one number contains another. It also represents how small or large one number is compared to the other.
Trigonometric Ratios
Trigonometric ratios give values of trigonometric functions. It always deals with triangles that have one angle measuring 90 degrees. These triangles are right-angled. We take the ratio of sides of these triangles.
An observer is 20 m above the ground
floor of a large hotel atrium looking at a glass-enclosed elevator
shaft that is 20 m horizontally from the observer (see figure). The
angle of elevation of the elevator is the angle that the observer’s
line of sight makes with the horizontal (it may be positive or negative).
Assuming that the elevator rises at a rate of 5 m>s, what
is the rate of change of the angle of elevation when the elevator
is 10 m above the ground? When the elevator is 40 m above the
ground?
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