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Degree
The unit of measure for angles

Angle of Depression
the angle formed by the line of sight and the horizontal plane for an object below the horizontal.

Angle of Elevation
the angle formed by the line of sight and the horizontal plane for an object above the horizontal.
Cotorminal
two angles that share the same initial and terminal sides
Trigonometric Ratios

Inverse Trigonometric Ratios
sin-1 or arcsin, cos-1 and arccos, tan-1 or arctan. Used to undo sine, cosine, and tangent in an equation
Law of Sines

Law of COsines

PYthagoream Thereom
