First Quadrant Unit Circle

This example demonstrates the geometric properties and trigonometric relationships within the first quadrant of a unit circle. It involves core mathematical concepts such as the definition of a unit circle, trigonometric functions (sin, cos), right triangles, and angle measurement. The construction utilizes GeoGebra commands and objects like Intersect (intersection), Point (point), CircleSector (sector), OrthogonalLine (perpendicular line), Segment (segment), and Angle (angle). It is suitable for high school mathematics education, helping students understand the intrinsic connection between trigonometric functions and the unit circle, as well as basic analytical geometry construction techniques.