The distance between two parallel lines in space
1. Click to see points A and B on lines L1 and L2 respectively;
2. Click to see the vector AP;
3. Move the slider so that the vector AP is perpepndicular to L2;
4. Use "Rotate 3D Graphics View" to see from different perspectives;
5. For full 3D effect: Right click select Graphics - 3D Graphics - Projection - Glasses. Move the view to the right using your mouse and then put on your red-cyan 3D glasses and enjoy.