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A protractor is a mathematical tool used to measure angles. It is a semi-circular device that is usually made of transparent plastic or metal. It has markings that measure in degree from 0 to 180, with each degree corresponding to a visible line on the protractor. The protractor helps in measuring some basic angles such as right angles (90 degrees), straight angles (180 degrees), acute angles (less than 90 degrees) and obtuse angles (more than 90 degrees).

Types of Protractors

Protractors come in different types and can be made of various materials, such as brass, steel, or plastic. The most common type of protractor is the plastic or cardboard protractor, which is commonly found in geometry sets. Metal protractors are often more sturdy and durable, making them ideal for professional use.

Circular Protractor

A circular protractor is the most common type of protractor. It is semi-circular in shape, with degrees marked on the curved edge. Some circular protractors are also divided into quarter and half circles, depending on the requirements of the user.

Flat Protractor

A flat protractor is a sheet of plastic or metal with degree markings along the edge. They are lightweight and can be easily carried around. They come in different designs such as rectangular or triangular

How to Use a Protractor?

Using a protractor is easy, and all it takes is a little bit of practice. The following steps should be followed when using a protractor:

1. Place the protractor flat on the surface of the paper or material that you want to measure
2. Place the center of the protractor over the vertex of the angle you want to measure
3. Align one side of the angle with the zero-degree line on the protractor
4. Determine the number of degrees between the zero-degree line and the other line of the angle you want to measure

It is essential to hold the protractor steady while measuring the angle to avoid any errors due to wrong positioning

Applications of a Protractor

Protractors are prevalent in a range of fields, including engineering, architecture, drafting, and mathematics. In addition, they are essential in measuring and marking angles such as roof pitches, stair stringers, and geometric shapes.

the protractor is an important tool for performing various calculations and measurements related to angles. Whether you are measuring angles for an engineering project or drafting a blueprint, a protractor is a must tool for an accurate measurement.

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