B1. The "Polygon" tool
Draw a triangle called "T"
With GeoGebra you can draw polygons by clicking the position of the vertices, but to inform GeoGebra that you have finished the polygon, you must click on the first point.
1st. Activate the "Polygon" tool.
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2nd. Click on three non-aligned points in the Graphics View and then click again on the first point. The points "A", "B", "C", the segments "a", "b", "c" and the polygon will appear.
3rd Activate the "Move" tool 
. Right-click inside the triangle to open the Context Menu and name it "T".
The two curved arrows located in the upper right corner of the Graphics View allow you to reset the activity.
If the activity is correct, you will get 10 points automatically.
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2nd. Click on three non-aligned points in the Graphics View and then click again on the first point. The points "A", "B", "C", the segments "a", "b", "c" and the polygon will appear.
3rd Activate the "Move" tool . Right-click inside the triangle to open the Context Menu and name it "T".
The two curved arrows located in the upper right corner of the Graphics View allow you to reset the activity.
If the activity is correct, you will get 10 points automatically.