How does the Geometric Sketchpad change the color of the arrow?

Method 1: Select line, "Display"-"Color"; Method 2: Select the line and right click-"Color".

(1) Double-click the parameter with the selection tool to change its value or name in the pop-up dialog box; (2) Select a parameter, execute the "Edit"-"Edit Parameter" command, and modify it in the pop-up dialog box; (3) Select a parameter, press the "+"key to increase the value, and press the "-"key to decrease the parameter value. In this example, the color can be easily changed. (4) Select parameters and click Edit-Operation Button-Animation to generate an animation button to drive the parameters to change.

As an essential tool for teachers to make mathematics courseware, the geometric sketchpad can not only help teachers draw geometric figures, but also achieve some dynamic effects, such as changing the figures or changing the colors of the figures. When learning geometry knowledge, we should abide by some "hidden rules", for example, right angles should be marked with right symbols, isosceles triangles should be marked with two angles with equal base angles, equilateral triangles should be marked with three angles, and so on. Some special numbers and relationships need to be marked and explained in order to make mistakes in solving problems.