What is a Ruler? - Definition, Types, and Uses

A ruler is a straightedge with measurements marked on it, used for measuring the length of objects or distances between points. It is typically made of plastic, wood, or metal, and can be found in various sizes and shapes depending on the intended use.

Rulers are commonly used in drafting, engineering, architecture, and other fields where precise measurements are important. They can also be used for simple tasks like measuring the length of a piece of paper or the width of a book.

Some rulers have additional features such as a scale that can be used to measure weights, or a protractor that can be used to measure angles. There are also digital rulers that use electronic sensors to measure distances and display the results on a screen.