[size=200][b]Draw a line and name it "r"[/b][/size][br][br][color=#000000]The lines have no beginning or end, but GeoGebra can only draw them in the Graphics View using two points to define the line.[/color][br][br][color=#9900ff]1st. Select the "Line" tool [icon]/images/ggb/toolbar/mode_join.png[/icon].[/color][br][br][color=#9900ff]2nd. Click twice in the Graphics View (the line and both points appear).[/color][br][br][color=#9900ff]3rd. Name the line you have just drawn "r".[/color][br][br][color=#000000]You can also create two points with the "Point" tool [icon]/images/ggb/toolbar/mode_point.png[/icon], then activate the "Line" tool [icon]/images/ggb/toolbar/mode_join.png[/icon] and click on both points. Try to drag the points and the line with the mouse.[/color][br][br][color=#000000]The two curved arrows located in the upper right corner of the Graphics View allow you to reset the activity.[/color][br][br][color=#000000]If the activity is correct, you will get 10 points automatically.[/color]