FIGURE 12.

SIDES IN REFERENCE TO ANGLE "A."

or "a" over "c." In each ratio the letter in the same position as "a" in

relation to "c" represents the numerator, which can be given a numerical

value.

The letter "c" in relation to the position of "a" represents the

denominator, which can be given a numerical value.

If the letter "a" is

assigned the numerical value of 2 and the letter "c" is assigned the

numerical value of 4, the mathematical expression would be that the number 2

must be divided by the number 4.

Thus, 2/4 = .5.

These ratios are the

trigonometric functions as described below: