Measuring Angles Using Protractor: Interactive Geometry Demo

① This GeoGebra example dynamically simulates the process of measuring an angle with a protractor, showing how to read the degree value directly. ② The core mathematical concept is angle measurement, involving the vertex, sides of the angle, and alignment with the protractor's scale, while also touching on relationships within geometric figures like triangles. ③ Construction highlights: The Random command generates random angles; Point, Segment, and Rotate build the angle's sides; Angle displays the measure; Textfield, Corner, and LaTeX create interactive input boxes and labels; buttons (button1-3) control randomization or reset; multiple image objects (pic1-pic4) represent the protractor visual. ④ Suitable for upper elementary to middle school students learning angle basics, and useful for teacher-led demonstrations or self-paced exploration to build geometric intuition and hands-on skills.