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# How can you know if a line is straight without using a ruler?

Updated: 4/28/2022

Wiki User

15y ago

Compare it to a very fine plumb line. Construct your line with a Peaucellier-Lipkin Linkage (see link below). Examine the line with a laser device.

Wiki User

15y ago

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Q: How can you know if a line is straight without using a ruler?
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