Challenge 04: Play by Dragging Connections
- Gerry Stahl
Play totally online. Discuss what you are doing in the chat. This way you have a record of your ideas. Even if you are sitting near your teammates, do not talk out loud or point. Do everything through the computer system. In general, try to say in the chat what you plan to do before you do it in GeoGebra. Then, say what you did in GeoGebra and how you did it. Let other people try to do it too. Finally, chat together about what you all did. Take turns doing steps. Play together as a team, rather than just trying to figure things out by yourself. When you construct a point to be on a line (or on a segment, or ray, or circle) in dynamic geometry, it is constrained to stay on that line; its location is dependent upon the location of that line, which can be dragged to a new location. Use the “drag test” to check if a point really is constrained to the line: select the Move tool (the first tool in the Tool Bar, with the arrow icon), click on your point and try to drag it; see if it stays on the line. Drag an endpoint of the line. Drag the whole line. What happens to the point? Drag points and segments to play with them. The drag test is one of the most important things to do in dynamic geometry. Make sure that everyone in your team can drag objects around.