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Protractors

A protractor is used by students to measure angles, but they also come in handy for other things such as measuring distances and calculating areas. This guide explains what you need to know before purchasing a protractor.

SALE!RANK #1
24 Pack Plastic Protractors Math Protractor 180 Degrees 6 Inch, Clear
  • 24 Pack plastic protractors: math protractor features an open center and accurate 6 inches ruler...
  • Measure range: range of 0 to 180 degrees, the minimum accuracy of the angle is 1 degree, each 10...
  • Clear and good quality: the protractor made of good quality plastic; Clear color allow you see the...
  • Wide applications: the geometry protractors are suitable for measure, student work, graphing of...
  • Good gift for children: abundant bulk, you can make it as gifts for your kids in school, friends;...
SALE!RANK #2
Student Geometry Math Set, Drawing Compass and 6 Inch Clear Swing Arm...
  • 2 Piece math set: compass and protractor are great for drawing circle and measuring angle, good for...
  • 2 Diverse tips design compass: compass is made of stainless steel, sturdy mechanism can hold a...
  • Integrated compass package: compass comes with a clear box, contain 1 piece geometry compass and 1...
  • 6 Inch protractor: made of plastic, inch marks is up to 6 inch, centimeter marks is up to 10 cm;...
  • Warm notice: if you receive the product and found the screw of compass is loose, do not worry, it is...
SALE!RANK #3
Plastic Protractor Math Protractors 180 Degrees, 6 Inch, Clear, Pack of 2
  • Measuring range: protractor measures 0 to 180 degrees left to right and right to left; Protractor...
  • 2 Pack protractors: practical quantity, you can leave one at home and put the other at school or...
  • Size and material: the size of the plastic protractor is 6 inch, color is clear; With hollow center,...
  • Use easily: you can use the geometry protractors to get the angle and length quickly; Easy to carry...
  • Wide application: the ruler protractors are suitable for painting, measure, homework, technical...
SALE!RANK #4
30PCS Clear Plastic Student Math Protractor 6-Inch Long 180 Degree for...
  • ✿MATERIAL: Plastic. SIZE: 6 inch.
  • ✿COLOR: Clear color allow you see the words, letters, figures on page through the protractor.
  • ✿PACKAGE INCLUDE: 30pieces high quality 6 inches clear protractors.
  • ✿PURPOSE: The geometry protractors are suitable for measure, student work, painting, technical...
  • ✿ADVANTAGES: A range of 0 to 180 degrees, the minimum accuracy of the angle is 1 degree; each 10...
RANK #5
eBoot 28 Pack Clear 180 Degree Plastic Protractors for Angle Measurement,...
  • 28 Pack plastic protractors: made of clear plastic with smooth surface, durable; The black marking...
  • Clear protractor: transparent color allow you to see the words, letters, figures through the tool,...
  • Proper size: the bottom side length is 10 cm, 4 inch proper size for carrying conveniently and make...
  • Good design: range of 0 to 180 degree, accurate to 1 degree, each 10 degree have a clear line to...
  • Practical measure math tool: the geometry protractors are suitable for painting, measure, homework,...
SALE!RANK #6
eBoot 50 Pack Math Protractors Plastic Protractor 180 Degrees, 4 Inches,...
  • Measure math tool: the geometry protractors are suitable for painting, measure, homework, technical...
  • 50 Pack protractors: the material is plastic; The bottom side length is 10 cm, 4 inch size make it...
  • Sturdy protractors: this clear plastic protractor is thick enough, thus they are not easy to snap;...
  • Black accurate number: the black numbers are clear and easy to identify, then you can read quickly...
  • Common protractor: the plastic protractors are the common shape protractor, it's universal, you can...
SALE!RANK #7
hand2mind Safe-T Protractor for Kids, 180 Protractor, Rainbow Plastic Clear...
  • PROTRACTOR FOR KIDS MATH: Each protractor is perfect for measuring angles and is essential for math...
  • SAFETY PROTRACTOR: Our Safe-T branded protractor performs all the functions of a standard protractor...
  • PROTRACTOR FOR GEOMETRY: Help students master geometry with this safety protractor.
  • CLEAR PLASTIC PROTRACTOR: This clear plastic protractor makes it easier to draw and measure angles...
  • ESSENTIAL HOMESCHOOL SUPPLIES: Set up your students in their home classroom with these classic math...
RANK #8
Mr. Pen Protractor, 6 Inches Protractor, Pack of 3
  • 6-Inch Protractor (3 Pack)
  • Made With Transparent Clear Plastic
  • Easy-To-Read Inch And Centimeter
  • Accurate And Long Lasting Prints
  • Protractor Size: 6 X 3 X 1/8 Inch
RANK #9
12 Pack Plastic Protractor 6 Inches Math Protractors 180 Degrees for School...
  • Size and material: 6 Inch protractor made of plastic, inch marks is up to 6 inch, centimeter marks...
  • Measuring range: Range of 0 to 180 degrees, and clear color allow you see the words, letters,...
  • Geat value: This set includes two 6 Inch(15 cm) protractor, one can use in home, the another use in...
  • Use easily: You can use the geometry protractors to get the angle and length quickly; Easy to carry...
  • Wide application: Protractor are great for drawing circle and measuring angle, good for students,...
RANK #10
Westcott 14558-002 2 Piece Math Tools, Compass & Protractor Set (Assorted...
  • Plastic point compass draws up to a 13" diameter circle
  • Compass includes easy grip top control with two-sided 6-inch/15-centimeter measuring
  • Plastic 180-degree protractor is shatter resistant with a 6" ruler
  • Highly functional and fun to use with exciting colors and designs
  • Available in assorted colors (colors can’t be specified when ordered)

Buyer's Guide

How to choose the
best protractor

What is the Purpose Of A Protractor?

The protractor is a tool used to measure angles. It consists of two arms connected by a central pivot point. One arm has a 90 degree angle marked on it while the other arm has a 0 degree mark. The user places the end of the measuring arm into the desired position and turns the handle clockwise or counterclockwise to determine the angle between the two arms.

How To Use A Protractor

To use a protractor, hold the instrument steady and align the center line with the axis of rotation. Then turn the handle until the indicator lines meet at the zero mark. Once aligned, read the number on the scale to determine the angle.

Protractors Are Used For Measuring Angles

Angle measurements are commonly used in construction, engineering, architecture, surveying, and many other fields. Protractors are useful tools for determining angles. They are inexpensive and easy to use. However, there are several types of protractors available including the following:

Dial type - these include a circular dial which rotates around its own axis. The dial is graduated in degrees and is set to indicate the required angle.

Tripod type - these consist of three legs joined together by a common base. The top leg is fixed and the bottom two rotate around the fixed leg. The lower ends of the rotating legs are attached to a pointer which indicates the angle.

Cylindrical type - these are cylindrical tubes with a small hole in the middle. The tube is placed over a straightedge and rotated to show the angle.

Arc type - these are shaped like a circle and contain a series of markings along the circumference. The arc is turned to show the angle.

Compass type - these are designed to be held in the hand and moved across a map or drawing to locate points. The compass needle always points north.

Plumb bob type - these are long sticks with weights at each end. Plumb bobs are used to check verticality. The plumb bob hangs vertically and the weight moves up or down depending on whether the object being measured is higher or lower than the plumb bob.

Level type - these are devices used to level objects. Level indicators are typically mounted on a tripod stand and are adjusted to match the height of the object being leveled.

Directional type - these

The Importance of Purchasing a Quality Protractor

A protractor is a tool used to measure angles. It consists of two arms connected by a central pivot point. One arm has a fixed scale while the other arm contains a movable scale. The user places the movable scale along the edge of the object being measured and rotates the protractor around its axis to determine the angle between the two scales.

How To Use A Protractor

To use a protractor, start by placing the movable scale along the edge of the object being measured. Next, rotate the protractor around its axis until the movable scale aligns with the fixed scale. Once aligned, read the number on the fixed scale to determine the measurement of the angle.

Types of Protractors

There are many types of protractors available today. Some are designed specifically for measuring angles while others are general purpose tools. There are several different styles of protractors including slide rule type, dial type, and digital protractors. Each type offers advantages and disadvantages depending on the application. For example, slide rules are generally considered easier to use than dial protractors. However, dial protractors are typically cheaper and easier to manufacture.

Benefits of Using a Protractor

Protractors are useful tools for determining angles. They are especially helpful when using trigonometry equations. For example, if you wanted to calculate the length of a triangle, you could use the Pythagorean theorem to solve the problem.

Where to Purchase a Protractor

Most schools and universities carry protractors in their science labs. Many online retailers sell protractors as well.

Protractors are useful tools for calculating angles. They are especially helpful when using trigonometry equations. For example, if you wanted to calculate the length of a triangle, you could use the Pythagorean theorem to solve the problem.

Features To Look For When Buying A Protractor

The most common type of protractor is the standard 90 degree angle protractor. However, there are many different types of protractors available today. Some are designed specifically for measuring angles while others measure arcs. There are also protractors that allow you to draw circles and ellipses. Here we will discuss the features to look for when purchasing a protractor.

Angle Measurement

Most protractors include a 90 degree angle measurement scale. Most protractors also include a 0 degree mark which indicates the starting point of the measurement. Many protractors also include a 180 degree mark which indicates the end of the measurement. Other protractors include a 360 degree mark which indicates the full circle being measured.

Arc Measurement

Some protractors are designed to measure arcs rather than straight lines. Arc protractors typically include two scales. One scale measures the length of the arc and the second scale measures the radius of the arc. Some protractors also include a zero degree mark indicating where the arc begins.

Drawing Circles & Ellipses

Protractors that allow you to draw circles and ellipses are very useful tools. These protractors are commonly found in engineering applications. They are also helpful for students who wish to practice drawing geometric figures. Some protractors include a ruler along with the ability to draw circles and ellipses. Others include a pencil holder and a compass.

Other Features

There are several other features that you may be interested in including a protractor that has a grid line indicator. This allows you to align the protractor with another object such as a wall or door frame. Another feature that is becoming increasingly popular is the ability to store multiple protractors inside each other. This allows you to create a larger protractor by stacking smaller protractors together.

How to Use a Protractor

To use a protractor, start by placing the protractor flat on a level surface. Next, set the protractor to the desired measurement using the appropriate marking method. Finally, hold the protractor firmly in place and read the measurement.

Protractors are instruments used to measure angles. There are many different kinds of protractors available. Some are designed specifically for measuring angles while others are general purpose tools. Here we discuss the most common types of protractors.

The Dial Protractor

This type of protractor has two arms which rotate around each other. One arm contains a graduated circle while the other arm contains a pointer. The dial protractor is very useful for measuring small angles. However, it cannot be used to measure large angles.

The Slide Rule

Slide rules are another kind of protractor. Unlike the dial protractor, slide rules contain no pointers. Instead, they consist of a series of scales marked with degrees. To use a slide rule, you must align the scale with the angle being measured. Then, you read the number on the scale and multiply it by 360 to determine the degree value.

The Angle Ruler

Angle rulers are similar to slide rules except that they are longer and wider. Like slide rules, angle rulers contain a series of scales marked with degrees. However, unlike slide rules, angle rulers are typically used to measure larger angles. For example, you could use an angle ruler to measure the angle between two lines.

The Compass

Compasses are used to measure angles. Compasses are essentially long sticks with a needle attached to one end. The needle points towards the center of the compass. As you turn the stick, the needle moves along the length of the stick. At the same time, the needle indicates the direction in which the stick is pointing.

How to Use a Protractor

To use a protractor, follow these steps:

Place the protractor on top of the line segment you wish to measure.

Turn the protractor clockwise until the arrow points toward zero (0).

Read the number on the scale corresponding to the angle you wish to measure.

Multiply the number by 180 to obtain the degree value.

Add the degree values obtained from both sides of the line segment.

Divide the sum by 2 to

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