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One can draw a straight line by using a ruler. Should a ruler not be available, one can use the edge of a book or another piece of paper to guide the line straight.
In the same way that you would use any other ruler except that you use the centimetre scale.
measuring scale, tape, or ruler is used.
A ruler shows set measurements, either in inches or millimeters. You can draw a straight line using the edge of a ruler. Use a ruler to measure the size of a piece of typing paper.
It depends on what you are measuring, use a ruler and go to the in. side if a ruler is too small, use a yardstick