2024 Author: Priscilla Miln | [email protected]. Last modified: 2023-12-16 00:21
Every student knows what a protractor is. This seemingly unsightly tool performs very important functions not only in mathematics lessons. About what it is, as well as how to use it correctly, we will tell further.
What is a protractor?
A protractor is an object with which each of us can not only measure angles, but also build them. Outwardly, it resembles a semicircular ruler with a scale and divisions. Below, on a flat surface, is the usual straight ruler for measuring segments. In the upper part - a semicircle with a double scale for measurements. In each of the directions, the scale is dispersed along the protractor from 0 to 180 degrees.
Terms of use
At school they explain what a protractor is in mathematics lessons. This is where the need for measurements comes in.
In order for us to find out what one degree is, we need to divide the circle into 360 equal parts. One of these parts will be equal to 1 degree. The size of the circle will not affect the degree in any way! This is easy to check.
Let's draw two circles of different diameters andLet's divide each into 360 equal parts. Then we superimpose the smaller circle on the larger one and see that the lines matched.
Measuring the angle
Protractor helps to build and measure an angle. The degree is a common unit used to measure angles. There are several types of angles:
- Spicy. This is called an angle up to 90 degrees.
- A right angle is a 90 degree angle.
- An obtuse angle ranges from 90 to 180 degrees.
- A straight angle is a straight line or 180 degrees.
- A full angle looks like a circle and is 360 degrees.
It's easy to figure out how to measure an angle. In order to find out what the value of the angle is, we need to install the protractor so that its center is located at the apex of the angle, and the straight side coincides with one of its sides. The scale will tell us the number of degrees of a given angle. Here's a simple way we can find out what's around the corner in front of us.
To construct an angle with a given degree, attach the straight part of the protractor to the line, and its center to the beginning of the line. Subsequently, this point will be the vertex of the corner. Then on the scale we look for a given number and put a point. Now the protractor can be removed and connected by a segment to the beginning of the line (the top of the corner) with the marked point.
School stationery produced by different companies differ in material, color, size. So: for those whose protractor turned out to be longer than the length of the angle, it is not possibleto determine its value, the side of the angle must be extended using a straight ruler.
Student set
It's not for nothing that junior students are not familiar with the protractor. When applying it, a certain knowledge base must be laid. For full-fledged work with him in the lesson, the guys study a number of related subjects. Before learning what a protractor is, students must master a straight ruler, draw straight lines, study addition and subtraction, master a compass, know geometric shapes, and so on. This whole process takes time, and only after graduating from elementary school can a student add a protractor to his toolbox.
Students are now offered school stationery in a huge selection. The protractor is no exception. Manufacturers try to satisfy the most demanding needs of customers. Tools are made in various colors. Bright colors are always loved by children. Sometimes even in the same class you cannot find the same protractors, which makes it easier to find them if you lose them. Everyone chooses shapes and sizes to their taste.
Most of these products are made of plastic, and this greatly reduces its cost. But there are wooden and even iron protractors. As practice shows, although metal ones are opaque, they are more practical in the sense that the scale is not erased, and this allows you to use it in action much longer, accurately determining the angles.
The protractor is not as much in demand by schoolchildren as the ruler, but it accompanies students until the final exam. Somefrom the graduates of the school they choose speci alties that are related to measuring and constructing angles, designing buildings and structures, and working with drawings. By virtue of their professions, they constantly have to deal with protractors and its derivatives. But even former classmates of current engineers, sometimes even with the deepest humanitarian bias, can easily remember the skills of handling this object and determine the number of degrees at any angle.
Result
Today, modern children are used to getting any information from the Internet. However, it will not help in any way in measuring angles. Only the ability to use a protractor will make it possible to correctly determine them. This will undoubtedly come in handy for future engineers and designers in their work, and every educated person should have the skills to work with protractors, so everyone should be able to use such a tool!
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