C6. The "Circumcircular Arc" tool

[size=200][b]Draw the horseshoe arch[/b][/size][br][br][color=#000000]The horseshoe arch surpasses a semicircle. You have to distinguish between the centre of the arch and the centre of the starting line.[/color][br][br][color=#9900ff]1st. Activate the "Circumcircular Arc" tool [icon]/images/ggb/toolbar/mode_circumcirclearc3.png[/icon].[/color][br][br][color=#9900ff]2nd. Click on the beginning of the arc located on the left. It will be the point "A".[/color][br][br][color=#9900ff]3rd. Click on the top of the middle arch. It will be the point "B".[/color][br][br][color=#9900ff]4th. Click on the end of the arch located on the right. It will be the point "C".[/color][br][br][color=#9900ff]5th. Activate the "Midpoint or centre" tool [icon]/images/ggb/toolbar/mode_midpoint.png[/icon] and click on points "A" and "C". It will be the point "D", the centre of the arch's starting line.[/color][br][br][color=#9900ff]6th. Click on arch "c". It will be the point "E" that is the centre of the arch.[/color][br][br][color=#9900ff]7th. Activate the "Point" tool [icon]/images/ggb/toolbar/mode_point.png[/icon] and click on arch "c". The point "F" appears above the arch.[/color][br][br][color=#9900ff]8th. Activate the "Ray" tool [icon]/images/ggb/toolbar/mode_ray.png[/icon] and click on points "D" and "F".[/color][br][br][color=#9900ff]9th. Activate the "Move" tool [icon]/images/ggb/toolbar/mode_move.png[/icon] and name the ray "s".[/color][br][br][color=#000000]Animate point "F" and you will see how the bricks follow the direction of the ray.[/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]

Information: C6. The "Circumcircular Arc" tool