D4. The "Reflect Object in Line" tool
Reflect the cat over an axis
A reflection transports the points of an image to the other part of the axis, perpendicularly and at the same distance.
1st. Activate the "Line" tool 
.
2nd. Click on two places in the Graphics View, not on the cat. The points "A", "B" and the line "f" appear.
3rd. Activate the "Reflect Object in Line" tool 
.
4th. First click on the cat and then on the line "f". You will get the cat reflected.
Activate the "Move" tool 
and move the points, the line and the original cat.
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.
.
2nd. Click on two places in the Graphics View, not on the cat. The points "A", "B" and the line "f" appear.
3rd. Activate the "Reflect Object in Line" tool .
4th. First click on the cat and then on the line "f". You will get the cat reflected.
Activate the "Move" tool and move the points, the line and the original cat.
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.