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I have no idea what you are asking for. Your question is very vague. You could perhaps use a measuring device like a ruler for a short distance, or a measuring tape for longer ones. In case it is a line on a cartesian plane, you can use Pythagoras' Theorem. You could perhaps make use of the cosine rule if you have a triangle with an angle theta between the two other sides. Or the sine rule: As I said before, your question is vague. :( |
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