### Home > CCA2 > Chapter Ch10 > Lesson 10.1.4 > Problem 10-69

10-69.

Use reference angles, the symmetry of a circle, and the knowledge that cos

Draw a unit circle diagram for the given angle. **Unit circle, with right triangle in first quadrant, labeled as follows: hypotenuse, 1, horizontal leg, 1 half, angle opposite vertical leg, pi thirds.**

Reflect the triangle in each of the **Added to the unit circle, a right triangle in second quadrant, labeled as follows: hypotenuse, 1, horizontal leg, negative 1 half.**