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Ruler
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This page is about the drawing and measuring tool. For someone who is in charge of something, see Monarch.
A ruler[1] is an instrument of measurement. Rulers measure length. Length is how long or short something is. Most rulers work by having numbers (parallel[2] to the measuring edge) and little lines (perpendicular[3] to the measuring edge). Rulers can also be used as a straight edge to draw lines with.
Rulers come in many different forms. They can be made of plastic, wood and metal, and other materials. Rulers also come in a variety of lengths. For example, there are 1 metre rulers, 30 centimetre rulers, 20 centimetre rulers and 15 centimetre rulers. These are examples of metric rulers. You can also get 1 yard rulers, 18 inch rulers and 6 inch rulers, etc. These are examples of imperial rulers.
