Using 30° - 60° - 90° triangles to find coordinates on the unit circle

Part 3 of 3. Using the unit circle we constructed in Part 1: https://youtu.be/T-Y91LinlYs , we find coordinates for points on the unit circle using 30° - 60° - 90° triangles (see here for more about these special triangles: https://youtu.be/SSrvCbYefmo ) Part 2, about 45° - 45° - 90° triangles, can be found here: https://youtu.be/Bol_gXeyyUA