[size=200][b]Draw an obtuse angle called "α"[/b][/size][br][br][color=#000000]An obtuse angle is greater than a right angle (90º) and lower than an straight angle (180º).[/color][br][br][color=#9900ff]1st. Activate the "Ray" tool [icon]/images/ggb/toolbar/mode_ray.png[/icon] and draw two rays. The first one with the origin in point "A" and running through point "B" and the second one that begins at point "A" and runs through the point "C".[/color][br][br][color=#9900ff]2nd. Name one ray "r" and the other one "s".[/color][br][br][color=#9900ff]3rd There are two ways to show the angle:[/color][br][br][color=#9900ff][b]First way: [/b]Activate the "Angle" tool [icon]/images/ggb/toolbar/mode_angle.png[/icon] and click on three points that define the rays. (The second click must be on the vertex). Activate the "Move" tool [icon]/images/ggb/toolbar/mode_move.png[/icon] and move the points until the angle becomes obtuse.[/color][br][br][color=#9900ff][b]Second way: [/b]Activate the "Angle" tool [icon]/images/ggb/toolbar/mode_angle.png[/icon] and click on two rays. With the "Move" tool [icon]/images/ggb/toolbar/mode_move.png[/icon] activated, move the points until the angle becomes obtuse.[/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][color=#000000]If the activity is correct, you will get 10 points automatically.[/color]