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That suggestion is mathematically correct, but it can lead to a dangerous situation, if the board is comparatively narrow and now you are putting the narrow end up against the fence.
I believe the conventional solution is to clamp a board to the left or right of the workpiece, which then acts as a side fence. If the workpiece is small, it should be screwed to a larger board to act as a jig.
If you collect Norm Abram books, I think you'll see what I'm talking about in the one that has the marble toy project (with the ramps).