Unit Circle, Radians, and Degrees by Michael Bostwick

This example demonstrates the relationship between angles, radians, trigonometric functions (sine, cosine, tangent), and tangent lines on the unit circle. It involves core concepts like the unit circle, radian measure, degree measure, and geometric constructions of tangents. GeoGebra commands used include Circle, Segment, Angle, CircleArc, and Intersect. Suitable for high school mathematics education to visualize trigonometric functions and their geometric interpretations.