### Home > PC > Chapter 4 > Lesson 4.1.2 > Problem 4-24

4-24.

Find the following values using special right triangles (give exact values). Do not use your unit circle, except to check.

1. Draw circle and locate the angle. Circle with dashed, horizontal diameter, 5 green points located as follows: on left & right ends of diameter, at center of circle, & 2 points equally spaced, on top half. Blue point on the lower left quarter of the circle.

2. Draw a right triangle whose base is the -axis. Added: right triangle in fourth quadrant: horizontal leg, on the negative, x axis, hypotenuse, from center of circle to blue point.

3. Label side lengths. Labels added: horizontal leg, negative 1 half, vertical leg, negative 1 half times square root of 3.

4. Choose the -value for the sine!