Adjacent Side

The leg of a right triangle that is not opposite a given angle.
Angle of Depression

The positive acute angle formed by a horizontal surface and a
vector extending below it.
Angle of Elevation

The positive acute angle formed by a horizontal surface and a
vector extending above it.
Hypotenuse

The side of a right triangle opposite the right angle.
Opposite Side

The side of a right triangle opposite a given angle.
Cosecant

Let
A
be an acute angle in Triangle ABC;
csc(A) =

Cosine

Let
A
be an acute angle in Triangle ABC;
cos(A) =

Cotangent

Let
A
be an acute angle in Triangle ABC;
cot(A) =

Secant

Let
A
be an acute angle in Triangle ABC;
sec(A) =

Sine

Let
A
be an acute angle in Triangle ABC;
sin(A) =

Tangent

Let
A
be an acute angle in Triangle ABC;
tan(A) =
