Protractor: Which are the best of 2021?
Today we want to offer you a good decision angle, since our subject is: angle transferor.
Who has never taken geometry lessons? Geometric shapes are all around us, even technological products speak from angles. The viewing angle of a screen, the opening angle of a device, among others.
A protractor is the most used tool to measure and identify these angles. Its use ranges from civil construction to aeronautics, including navigation. And if you continue reading you will know everything you need to choose and operate this tool!
First, the most important
- Protractors can be either amateurs (those made of plastic used in school) or professionals (metallic or digital). The basic difference is the need for application.
- There are not just degrees, but thousandths of degrees. Therefore, some are able to provide exact precision. Even for shooting applications.
- Its use is quite simple, but it needs attention. On a 360 ° protractor (round), you can take an upside-down reading if you don’t know what you’re looking for.
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Ranking: The 4 best transferors
The protractor can be of different types. And so that you do not make a mistake in your choice, we have selected the best models on the market. Check out each one and then read on, so you will learn to identify which best meets your needs:
What’s up? Were you able to decide which angle protractor is right for you? If not, don’t worry. Throughout this Guide we will clarify the details of this tool.
Just follow us to learn about its advantages, prices, differences and fundamental selection criteria.
What is an angle protractor?
It’s basic math. Geometry, to be more exact. You need a protractor to identify angles that are not right. Remember the types of triangles, and that at each junction they have an angle?
Still searching in memory? Okay, well, we’ll give you the best lesson on the subject. But first, how about we know the advantages and disadvantages of using this tool?
The transferor will accompany you in mathematics and physics studies. And, depending on your professional branch, it will also be an office item. In civil construction, for example, they are well used (as long as you use a drawing board and not software).
For traditional navigation, they are also very welcome. Nautical charts, and visualization of the stars required angles for distance measurement and calculations. And the angles were obtained by the protractor (or as close to that as they could build).
In physical terms, the protractor is a semicircular piece of rigid plastic, with grade markings notched on the outer edge of this arch. In the center there may or may not be a bubble mark, or a straight line. It is from there that you measure the angle.
What is the angle?
As important as the protractor is what it measures. So we think it’s important to dedicate part of the reading to them. After all, is it worth understanding the product without knowing its purpose?
It can be simple or not. It depends on how much you like math, physics and math with calculations. Or even how good he is at logic and likes craft work.
Fact is, angles are essential. In fact, every time two line segments come together, they are there. And this is basically a definition:
The unit of measurement derived from the gap between two straight lines that meet.
Once we know what they are, let’s go to how they work. This unit of measurement is based on a perfect (round) circle. Some prefer the use of a perfect semicircle.
he protractor as a perfect circle, divided into 360 degrees (or zero, again). (Source: OpenClipart-Vectors / Pixabay)
In this opening of a perfect circle, 360 markings, called degrees, with the ° symbol were assigned. In a semicircle this number drops to half.
The exact intention was to be able to measure this “space” between the lines. As evolution progressed, the use of angles was followed for different areas of science.
You have probably played, or seen someone playing fighting on your smartphone or video game or computer. In some games, you need to achieve something from a distance. What do you use? Speed and angle.
How do we measure an angle?
You need to take into account, however, that the angles range from 0 to 360 ° (a complete turn). Then, when measuring with a semicircle, you will be able to get angles up to 180 °. But, they can also be used for greater angles, just inverting it.
And taking care to correctly calculate the aperture (180 + x). Yes, an x. Protractor is math, get used to it.
Its use is extremely important for any calculation that involves connections between straight lines. The construction of beams and walls, the welding of metals, the shape of something in wood or its use in construction.
That is why it is so important to know the main angle measurement instrument.
What is the difference between protractor and goniometer?
It is very likely that you have never heard of this second term. Unless you’re a big fan of physics or end up working with it in some way.
Goniometer is basically a brother to the protractor. Both devices allow the measurement of angles, and many times the goniometer even exceeds the simple to visualize, identify, or mark an angle.
Movement is the main difference between these two devices. While the protractor is usually used to measure degrees, the goniometer goes further. It has a static arm attached to the fixed base.
This arm allows to measure the amplitude of a movement (physiotherapists and connected areas use this information). In addition, there are several types of goniometers to perform various tasks.
So the advice is: if you are a physics enthusiast, take the path of goniometers. Otherwise, stay on the protractor track. After all, an aerospace school instrument has its potential there, doesn’t it?
You can learn more about the goniometer through this video on Adilson Pinheiro’s channel:
From school use (which is sufficient for many activities), you will find the product, for R $ 15. But, they can be found for values above R $ 1,000. And this has a simple explanation: the more complex the task, the smaller the margin of error that exists.
More expensive equipment will provide the information with a minimal margin of error, which is an advantage if you consider that the protractor has even military use. May they continue to evolve towards absolute precision.
Where to buy?
Easily available, protractors can be found at any stationery store or even a department store. It is possible that all stores with school supplies have some product option.
Of course, the greater the need for the equipment in terms of accuracy, or even facilities, the purchase option will be restricted. In this case, building materials and some specialized stores may be the only physical option.
The online search will reveal a huge range of tools. Online stores. Amazon have a wide range of options. You compare, choose, and receive at home!
Purchasing criteria: Factors to compare protractor models
You already have a lot of knowledge about a protractor, and since we are reaching the end of our article, it is opportune to leave the final teachings here. When purchasing a protractor, take the following into account above all:
- University graduate
- 180 or 360
- Digital protractor
Depending on the use of the protractor, there will be an acceptable margin of error for carrying out the task.
Let’s think about this: an angle is an opening. Therefore, a 45 ° opening measured at 10 cm will be the same as measured at 10 meters.
Therefore, the greater the margin of error, the greater the impact of the error according to the distance followed by the line. This may be due to carelessness or lack of graduation.
180 or 360
It is convenient for you to define the main applications of the equipment. And if a circle is necessary or, or semicircle is enough.
Semicircles can be easier to handle and more compact to store. But, not everyone is able to get used to them, or even measurements may always require a degree greater than 180 °.
As they are sturdy tools, it is a choice that you will keep for some time.
Use is an essential condition for choosing the tool. For an undemanding function, you can opt for acrylic, school standard.
If you need it for technical drawings, choose those with a higher level of grading between angles – as we saw in the first item – and preferably with attached rules systems, to facilitate dashes.
The purpose will define the specificity, the technical details of your transferor. Metal ones are more durable and of better quality, although more expensive.
The digital protractor is such a useful tool, over time it has been improved, mainly for use in the most precise fields.
These tools are more expensive compared to the others, and allow viewing the angle on an LCD display, often with a margin of error equal to or less than 0.1 degrees.
Although easier to identify the angle, they are often more expensive than traditional ones (more than 20 times, if compared to the most common ones). They are worthwhile, as long as their use is professional and the investment returns to you.