It depends on what you are measuring the width of. Different units and different tools would be appropriate for a hair, a car or a galaxy.
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Millimeters or centimeters.
No, a ruler is used only to measure length, width or height. You must use a protractor in order to measure the degrees in an angle.
For a rectangle, length X width = area. Measure the length in cm. Measure the width in cm. Multiply the length X the width to get the area in cm2.
millimetres.
I would go with millimetres