To determine values of trigonometric functions,

(3, 4)

Step 1: Plot the coordinate on the coordinate plane

Step 2: Draw the angle in standard position, with the initial side on the positive *x* axis and the terminal side drawn from the origin to the coordinate (3, 4).

Step 3: Draw the right angle triangle

Step 4: Label the lengths of the sides *x* = 3 and *y* = 4,

Step 5: Using Pythagorean Theorem, determine side *r*. You will find that *r* = 5

Step 6: Knowing all three sides, determine the primary trigonometric ratios

Designed by Matthew Cheung. This work is licensed under a

Creative Commons Attribution 4.0 International License.