Reference Angles
The concept of reference angles will be used to find equivalent ratios for sine, cosine, and tangent in different quadrants.
The Unit Circle
The exact value of the trigonometric ratios for 0°, 30°, 45°, 60°, and 90° will be discovered by analyzing the unit circle using special triangles.
Polygon Angles
This problem set deals with the internal and external angles of the polygons up to an octagon.