Geometric Construction of Generalized Protractor

This example demonstrates how to construct a dynamically adjustable generalized protractor in GeoGebra. Users can drag points on the protractor to measure various angles. Key mathematical concepts include central angle theorem, angle-radian conversion, and properties of isosceles triangles. Construction uses Sequence for tick marks, Point for control points, Vector for needle vectors, Angle for angle definitions, and If statements for dynamic display switching. Ideal for middle and high school math teachers demonstrating angle concepts and measurement, or for students exploring geometric construction principles.