Notice also, how the A, B, C & D lines form two triangles. If the CB and OB are aligned the same on the table, the triangles will be almost identical. In all cases one triangle will be the upside down mirror image of the other, but a different size depending on positions of the CB and OB....just an observation I noticed I thought I would share (geometry at work!).
Once you master this technique you can move on to hard/soft and english variations. Sometimes those shots come in handy if other balls are in the CB path. After you do this many times in practice you will learn to closely approximate the position of the kick point, thus making all this measuring unnecessary. The more you do it, the better you get at it!
To show the above diagram with the trajectory of the CB, note the below diagram with heavy black lines on the CB path for the kick shot, and also notice the angle in vs. angle out perspective between the black lines and the table using the measuring system presented here. You can take any of the below diagrams and draw the same angle in vs. angle out lines. (Hint: Copy image into PowerPoint and draw lines.)
Diagram 2 with CB angle in vs. out lines, showing kick shot
