ruler

Also known as rule, line gauge, tape measure

AI overview

A ruler is a straightedge tool marked with measurements (like inches or centimeters) that people use to draw straight lines and measure distances. It matters because it's a simple but essential tool for many everyday tasks in drawing, writing, construction, and crafting.

AI-generated from the Wikipedia summary — may contain errors.

Wikidata facts

Image: Ruler image.jpg

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Unicode character: 📏
Commons gallery: Ruler
exact match: wordnet-rdf.princeton.edu/wn30/04118776-n
Commons category: Rulers

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Article

8 sections

Contents

Variants
Use in geometry
History
Curved and flexible rulers
Philosophy
See also
References
Bibliography

A ruler is an instrument used to make length measurements, whereby a length is read from a series of markings called "rules" along an edge of the device. Alternatively, it is called a rule, scale, line gauge, or metre/meter stick. Usually, the instrument is rigid and the edge itself is a straightedge ("ruled straightedge"), which additionally allows one to draw straighter lines. Rulers are an important tool in geometry, geography and mathematics. They have been used since at least 2650 BC.