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You can, if you wish.
9×78=
You could use a tape measure. If your table is small, you could also use a meter stick or something the like. If it's REALLY small...well, I suppose you could use a ruler.
Don't use any demical points
The method you could use would be to find the average of the y-coordinates of the end-points.Using that method, you would find it to be -6 .You could use any other method you're comfortable with, but if it led to a different answer, it would be wrong.