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Home > PC > Chapter 4 > Lesson 4.3.1 > Problem 4-123


Given sin and . Find the values of the other trigonometric functions.

1. Draw a non-unit circle placing in the triangle in the appropriate quadrant.
2. Label/find the sides of the triangle. Don't forget the check the sign.
3. Now the other trig functions can be easily found from these sides.

In this case we are in the 2nd quadrant so it must be negative.
Circle with horizontal & vertical diameters, right triangle, hypotenuse from center of circle to point in second quadrant, labeled 3, horizontal leg on negative x axis, labeled negative square root of 5, vertical leg labeled 2, central angle labeled theta.