Sine
opposite/hypotenuse
cosine
adjacent/hypotenuse
tangent
opposite/adjacent
cotangent
adjacent/opposite
secant
hypotenuse/adjacent
cosecant
hypotenuse/opposite
radian
another measure used to describe an angle and is often used in trigonometry.
central angle
is the angle formed by two radii of the circle
radian is equal to
360/2pie approximately 57.3 degrees