Normally one side is Imperial: 12 inches (in fractions of an inch), and the other side is metric: 30 centimetres, with numbered centimetres and millimetre marks.
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Its straight edge and measurements will help in marking out polygons and the lengths of their sides.
A ruler. Measure one of the sides, and take that measurement times itself three times, and you'll have the volume.
What is the unit of measurement for a ruler and a angle ruler??????
6
The only restriction is that two sides must be the same and that the angles opposite those sides must be the same - and, therefore, acute. Other than that, any measurement.