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opposite/hypotenuse
Sine
is the angle from the horizontal to the line of sight of the observer to the object above.
Elevation
is an imaginary line that connects the eye of an observer to the object being observed.
Line of Sight
opposite/adjacent
Tangent
is the angle from the horizontal to the line of sight of the observer to the object below.
Depression
adjacent/hypotenuse
Cosine
defined as the values of all the trigonometric functions based on the value of the ratio of sides in a right-angled triangle.
Trigonometric Ratios
A triangle in which one of the interior angles is 90°
Right Triangle
longest part of a right triangle
Hypotenuse
