Unit Circle (Part 1): Construction & Angle-Coordinate Practice

This example visually demonstrates how points on the unit circle correspond to standard angles, linking geometric locations to coordinate values. It focuses on the unit circle (x^2 + y^2 = 1), the idea of matching angle measures to specific points, and the geometric interpretation of trigonometric functions—using a point’s coordinates as cos and sin values. The construction is built by defining multiple labeled points (A1, B1, A2, A3, B2, B4, B5, A6, A7, B8, A9, B10, B11) to mark key positions on the circle and to support reading/observing the relationships between angle position and coordinates. The activity is well-suited for early trigonometry learning, conceptual practice, and classroom demonstrations for middle to high school students or learners starting unit-circle-based trigonometry.