trigonometry
the study of the relationships between the sides and angles of triangles
ration
an expression that compares two quantities by division
adjacent leg
leg that is next to a given angle
opposite leg
leg that is across from a given angle
sine
opposite length/hypotenuse
cosine
adjacent length/hypotenuse
tangent
opposite length/adjacent length
inverse trig functions
allow you to undo a trig function and be left with an angle