What is a protractor? The rules of measuring angles

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2020-07-03 14:42:12

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Every schoolchild knows what a protractor. This seemingly unsightly tool performs very important functions not only in mathematics lessons. That he represents, and also how to use it, will describe below.

What is a protractor?

A Protractor is called the subject with which each of us can not only measure angles, but also to build them. Outwardly, it resembles a semi-circular ruler with scale and tick marks. Down on a flat surface, located familiar to us straight ruler to measure segments. In the upper part is a semicircle with a dual scale for measurement. In each of the directions is dispersed scale on the protractor from 0 to 180 degrees.

what is a protractor

Terms of use

The school explain what a protractor in math class. It is here that there is a need in the measurements.

In order For us to know what is one degree, you have the circumference divided into 360 equal parts. One of these parts will equal 1 degree. The value of the circumference will not affect the degree! It is easy to check.

Draw two circles of different diameters and divide each into 360 equal parts. Then apply a smaller circumference to a large and will see that the lines coincide.

Measure angle

Protractor helps to build and measure the angle. The degree is the standard unit, which is used for measuring angles. Several varieties of angles.

  • Sharp. This is called the angle to 90 degrees.
  • Straight angle is equal to 90 degrees.
  • Obtuse angle ranges from 90 to 180 degrees.
  • Straight angle is a straight line or 180 degrees.
  • Full-angle looks like a circle is 360 degrees.

school stationery

It is Easy to understand how to measure the angle. In order to know what the size of the angle we need to set the protractor so that its centre was located in the vertex of the angle, and the straight side has coincided with one of its sides. The scale will show us the number of degrees of this angle. That's the simple way we can know that the corner in front of us.

To build the angle with the given degree must attach the straight portion of the protractor to the line, and its center - to the beginning of the line. Subsequently, this point will be the vertex of the angle. Then on the scale we seek a specified number and set point. Now the protractor can be removed and connect the cut beginning of the line (the vertex of the angle) with the marked point.

School stationery, made by different companies differ in material, color, size. So: for those who have a protractor was greater than the length of the corner, and it is not possible to determine its magnitude, direction angle must be extended using a straight ruler.

Credential student

The Reason students at the Junior level are not familiar with the protractor. In its application should be laid down a certain basis of knowledge. To complete the work in the lesson, the children study a range of related subjects. Before you know what is a protractor, students need to master a straight ruler to draw straight lines to learn addition and subtraction, to learn the compass, to know geometric shapes, and so on. This whole process takes time, and just graduated from primary school, the pupil can add a protractor in your tool kit.

angle protractor

The Students are now available at school office supplies huge selection. The protractor is no exception. Manufacturers are trying to please the most demanding customers. The tools are made in various colours. Bright colors are always popular with children. Sometimes even in the same class will not find the same alarms, which facilitates the loss of their search. Shapes and sizes everyone chooses to your taste.

Most of these goods are produced from plastic, and this significantly reduces its cost. But there are even wooden and iron doors. As practice shows, even metal and opaque, but more practical in the sense that the scale is not erased, and it allows much longer to apply it in action, with the precision specifying angles.

A Protractor is not as popular with students as a ruler, but he accompanies students until the final exam. Some high school graduates choose specialties that are associated with the measurement and construction of angles, the design of buildings and structures, work with drawings. By virtue of their professions are faced with protractors and its derivatives. But former classmates and current engineers, sometimes even with the deepest humanitarian bias, easily remember the skills of handling the subject will determine the number of degrees fromany angle.

how to measure a corner

Summary

Today, modern children used to get any information from the Internet. However, it does not help in measuring angles. Only the ability to use a protractor will give the opportunity to define them. Future engineers and designers is undeniably useful in the work, and every educated person should possess the skills to work with protractors, so to be able to use this tool should be everyone!


Article in other languages:

BE: https://tostpost.com/be/dom-syam-ya/29238-shto-takoe-transparc-r-prav-ly-vymyarennya-kuto.html

DE: https://tostpost.com/de/das-haus-und-die-familie/29269-was-ist-der-winkelmesser-die-regeln-der-messung-von-winkeln.html

ES: https://tostpost.com/es/la-casa-y-la-familia/29298-qu-es-un-transportador-las-reglas-de-medici-n-de-ngulos.html

KK: https://tostpost.com/kk/y-zh-ne-otbasy/29205-b-l-transportir-erezhes-b-ryshtaryn-lsheu.html

PL: https://tostpost.com/pl/dom-i-rodzina/29079-co-to-jest-k-tomierz-zasady-pomiaru-k-t-w.html

PT: https://tostpost.com/pt/a-casa-e-a-fam-lia/29109-o-que-o-transferidor-as-regras-de-medi-o-de-ngulos.html

UK: https://tostpost.com/uk/d-m-s-m-ya/29187-scho-take-transportir-pravila-vim-ryuvannya-kut-v.html






Alin Trodden - author of the article, editor
"Hi, I'm Alin Trodden. I write texts, read books, and look for impressions. And I'm not bad at telling you about it. I am always happy to participate in interesting projects."

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