How to draw a wall in a geometric artboard

Step one open the geometry artboard, select the "line tool", in the artboard blank area to draw a horizontal line L, to represent the ground, as shown in the following figure.

To draw a horizontal line with a line tool in a geometry artboard L example

Step two Select the "Custom Tool" on the left toolbox, click on the mouse, and select "Physical Tool"-"wall" in the pop-up tool menu, as shown in the following figure.

Select the physical tools sample under the Custom tool

Step three mouse click at any position above the straight L, draw an end of the wall, hold down the SHIFT key, drag down the mouse until the wall and the line L have intersection point, then click the mouse, you can draw the wall perpendicular to the ground, as shown in the following figure.

Examples of walls drawn using physical tools

Learn the above tutorial, I believe you have learned to draw the wall in the geometry of the method, so that the use of geometric sketchpad to do optical courseware, you will not be confused, do not know how to do. Geometric artboards are not only used in the field of mathematics teaching, but also in physics and geography teaching, such as the dispersion experiment of light.