D7. The inversion around a point. The "Reflect Object in Point" tool
Rotate the GeoGebra symbol 180º
An inversion around a point is just a rotation of 180º around the point.
1st. Activate the "Point" tool 
and click on one point to the Graphics View to draw the point "A".
2nd. Activate the "Reflect Object in Point" tool 
.
3rd. Click first the image and then the point "A".
Activate the "Move" tool 
and move the original point and image.
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.
and click on one point to the Graphics View to draw the point "A".
2nd. Activate the "Reflect Object in Point" tool .
3rd. Click first the image and then the point "A".
Activate the "Move" tool and move the original point and image.
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.