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acute angles

angles that are less than 90°

adjacent

common side

angle of depression

angle created when looking below the line of sight

angle of elevation

An angle formed by a horizontal line and a line of sight above it.

cosine

the ratio of the adjacent leg over the hypotenuse of an angle

horizontal line

a line that is flat and parallel to the ground

hypotenuse

the longest side of a right triangle

identity

always true for the allowed values of the variable

leg

side of a triangle

line of sight

the imaginary line that inculed all that is directly in front of you

literal equation

an equation involving two or more variables

opposite

across from the angle given

ratio

a comparison of two quantities by division

right triangle

a triangle with 1 right angle

sine

Opposite/Hypotenuse

tangent

Opposite/Adjacent

trigonometry

the mathematics of triangles and trigonometric functions