In addition, the prescription for the mandatory use of units SI is set out in the current in Russia interstate standard GOST 8.417-2002, which lists the units of physical quantities allowed for use, lists their international and Russian designations and establishes the rules for their use.

International system of units SI - the most used system of units in the world both in everyday life and in science and technology. Currently SI adopted as the basic system of units by most countries in the world and is almost always used in the field of technology, even in those countries in which traditional units are used in everyday life.

SI defines 7 basic units of physical quantities and derived units (abbreviated - units SI or units), as well as a set of prefixes.

SI also establishes standard abbreviations for units and rules for writing derived units.

SI base units

• kilogram (kg, kg) - unit of mass
• meter (m, m) - unit of length
• second (s, s) - unit of time
• ampere (A, A) - unit of electric current
• mol (mol, mol) - a unit of the amount of a substance
• candela (cd, cd) - unit of luminous intensity
• kelvin (K, K) is 1 / 273.16 of the thermodynamic temperature of the triple point of water:
  1. degree Celsius (° C) is a widely used unit for measuring temperature, used in SI along with the kelvin

Conversion to degrees Celsius:

Within the framework of SI basic units are considered to have independent dimensions, that is, none of them can be derived from others.

Derived units are derived from fundamental units using algebraic operations such as multiplication and division. Some of the derived units in SI assigned their own names, for example, the unit radians.

CI prefixes must be used before unit names. They mean that one must be multiplied or divided by a certain integer, which is a power of 10, a number of times.

Decimal prefixes are used to reduce the number of zeros in the numerical values ​​of physical quantities.

For example:

• the prefix "kilo" means the multiplication of the original unit meter per 1000 (kilometer = 1000 meters)
• fractional prefix "milli" means multiplication of the original unit meter by 10 -3 (millimeter = 0.001 meters)
• fractional prefix "deci" means multiplication of the original unit meter by 10 -1 (decimeter = 0.1 meters)

Area units

For area units that are derived from the base unit of length meter, the list of names looks like this:

• length
  1. unit of measurement - meter
  2. designation (Russian) - m
  3. designation (international) - m
• square
  1. unit of measure - square meter
  2. designation (Russian) - m 2
  3. designation (international) - m 2

Explanation

Meter - the length of the path traveled by light in a vacuum over a time interval
1/299792458 seconds (XVII General Conference on Weights and Measures (GCMW), 1983, Resolution 1).

XXV GKMV, held in 2014, decided to continue work on the preparation of a new revision of the SI, including the redefinition of the meter, and tentatively planned to complete this work by 2018 in order to replace the existing SI with an updated version on XXVI CCMV in the same year.

The system for measuring the area of ​​land plots widespread in Russia (non-systemic in relation to the SI)

• 1 weaving = 10 mx 10 m = 10m x 10 m = 100 m 2
• 1 hectare = 1 hectare = 100 mx 100 m = 10000 m 2 = 100 ares
• 1 square kilometer = 1 km 2 = 1000 mx 1000 m = 1 million km 2 = 100 hectares = 10 000 ares

Reverse units

• 1 m 2 = 0.01 ares = 0.0001 ha = 0.000001 km 2
• 1 weaving = 0.01 ha = 0.0001 km 2

Area Conversion Table

• Hectare

a unit of area, in metric units, used to measure parcels of land.

Abbreviated designation:

• Russian - ha
• international - ha

1 hectare is equal to the area of ​​a square with a side of 100 m

The name "hectare" is formed by adding the prefix "hecto ..." to the name of the unit of area " ar»:

1 hectare = 100 ar = 100 mx 100 m = 10,000 m 2

• Ar - unit of area in the metric system of measures, equal to the area of ​​a square with a side of 10 m:
  
  1. 1 ar = 10 mx 10 m = 100 m 2
  2. 1 tithe = 1.09254 ha

• Acre

land measure used in a number of countries using the English system of measures (Great Britain, USA, Canada, Australia, etc.).

1 acre = 4840 sq yards = 4046.86 m 2

The most commonly used land measure in practice is hectare - abbreviated designation of hectare:

1 ha = 100 ar = 10,000 m 2

In Russia, the hectare is the main unit for measuring the area of ​​land, especially agricultural land.

On the territory of Russia, the unit "hectare" was introduced into practice after the October Revolution, instead of tithes.

Old Russian units of measurement of areas

• 1 sq. verst = 250,000 sq. fathoms = 1.1381 km 2
• 1 tithe = 2400 sq. fathoms = 10,925.4 m 2 = 1.0925 ha
• 1 couple = 1/2 tithes = 1200 sq. fathoms = 5462.7 m2 = 0.54627 ha
• 1 octopus = 1/8 tithes = 300 square plantations = 1365.675 m2 ≈ 0.137 ha

The area of ​​land plots for individual housing construction, private household plots is usually indicated in hundred parts

One hundred square meters- this is an area of ​​a plot measuring 10 x 10 meters, which is 100 square meters, and therefore is called a weave.

Here are some typical examples of the sizes that a land plot of 15 acres can have:

In the future, if you suddenly forget how to find the area of ​​a rectangular land plot, remember a very old anecdote. "Grandpa asks a fifth-grader:" How to find Lenin Square? " And he answers: "We need to multiply the width of Lenin by the length of Lenin" :)))

It is useful to familiarize yourself with this

• What can be built on plots for the implementation of a peasant (farm) economy (KFH) - read
• With the scales of topographic maps used in Russia, it is possible.
• You can learn about the new VRI Classifier - 2019
• From January 1, 2018, the exact boundaries of the site must be recorded in the cadastral passport, since it will be simply impossible to buy, sell, mortgage or donate land without an accurate description of the boundaries. This is regulated by amendments to the Land Code. A total revision of the borders at the initiative of the municipalities began on June 1, 2015.
• On March 1, 2015, a new Federal Law "On Amendments to the Land Code of the Russian Federation and Certain Legislative Acts of the Russian Federation" (N 171-FZ of 06/23/2014) came into force, in accordance with which, in particular, the procedure for buying out land plots from municipalities was simplified.You can familiarize yourself with the main provisions of the law.
• Regarding the registration of houses, baths, garages and other buildings on land owned by citizens, a new dacha amnesty will improve the situation

Each country has its own measurement system with its own values. Earlier in Russia it was used to denote ares. Today this measure is outdated and is practically not used, only sometimes you can find the designation in macaws, but, in fact, 1 ar is equal to 1 hundred square meters. Our summer residents routinely measure their plots in new units. If you ask them what is the area of ​​their site, then in response you will hear the values: six acres, ten acres. According to all official documents and the cadastral plan, land is calculated only in hectares. Therefore, it will be useful to know how to translate this measure into other quantities.

The new measurement system took root in Russia after the revolution in 1917. Before that, the old Russian designations of length and area were used. Land area was measured in tithes.

The popular concept of "weaving" took root when Russians began to massively allocate land for summer cottages. For convenience and simplified calculations, the area of ​​the dacha was determined by the number of sections included in it measuring 10 by 10 meters, which is 1 hundred square meters or are (100 sq. M). If you don't know, but want to calculate the land area in these units, it's easier to start with calculate area in meters and correlate these meters with macaws.

Suburban buildings on the site, subject to registration in 2019

Number of acres in 1 hectare

Since land plots are documented in hectares, it would be useful to know how many acres fit in hectares. From the table of measures we know, which is 10,000 square meters in 1 hectare. m. If the area of ​​one hundred square meters is equal to 100 sq. m. meters, it turns out that 1 hectare is exactly 100 acres. Now, if you are asked how much is 100 acres, you can confidently answer that this is 1 hectare of land.

If the site is not rectangular, but a different geometric shape (square, polygon or circle), how to calculate the weave in this case? The area of ​​the square will be equal to the product of the sides. The area of ​​the circle is calculated as the square of the radius. If a piece of land has the shape of a polygon, it is divided into triangles, the area of ​​each of them is calculated, and then the values ​​are added. First on the calculator you need to calculate the value in square meters, and the resulting number is divided by 100.

Such a designation as a hectare is often used in relation to large land plots. It is already inconvenient and inappropriate to measure them in smaller units, and the area is designated in hectares.

One square kilometer

Large plots for example, farms can have an area of ​​several square kilometers. Is it a lot or a little in hundreds? At the first stage of calculations, we calculate the area of ​​1 sq. km in meters. We multiply 1000 meters by 1000 meters and get 1 million square meters. meters. They are equal to 100 hectares, or 10 thousand acres. As you can see, it is more convenient to measure large areas in hectares.

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This measurement system is not adopted in all countries. For example, in the USA, Canada, Great Britain and some other states acres are used for these purposes. For reference: 1 acre = 4046, 86 sq. m. Acres, in turn, are subdivided into yards.

In advertisements for sale, as a rule, they use the usual designation and in the description of the plot indicate its area in hundred parts. Some people have a poor idea of ​​what such a piece of land will actually look like, whether it is large or not. During the years of mass construction of summer cottages, the townspeople were allocated a standard plot of 6 such units.

In the era of planning, it was calculated that the harvest obtained from 5 acres of land is enough to provide vegetables and fruits for a family of 4 people. The sixth unit of measure relied on the construction of a small country house. Today, such an area of ​​land allotment can be considered average in size.

Before you get to know the units of measure for area, you need to pay attention to how to calculate the area of ​​a shape. The first figure that is studied in school is a square. A square with a side of one unit is called a unit square. It can be 1 meter, centimeter, or any other value. The area of ​​other figures is always compared to the unit square. The area of ​​a figure shows how many unit squares will fit on its surface.

Rice. 1. Unit square.

In order to calculate its area, you need to multiply the two sides.

$$ S = 1cm * 1cm = 1cm ^ 2 $$

Rice. 2. Chess board.

To calculate the area of ​​a checkerboard, you need to multiply the width by the length. That is:

$$ S = 8 * 8 = 64 squares $$

And if we take 1 square of the chessboard as a unit square of 1 $ cm ^ 2 $, then the area of ​​the chessboard is $ 64 cm ^ 2 $.

Squares can be measured in different units, respectively, they have different designations.

Rice. 3. A square with a side that is measured in different units.

Correctly, the unit of measurement of area is called a square centimeter, or a square meter, depending on which unit the sides are measured in.

So, the units for measuring the area:

• $ 1 cm ^ 2 $;
• $ 1 m ^ 2 $;
• $ 1 km ^ 2 $;
• $ 1 hectare (ha) $;
• $ 1 ar (a.) $, Differently called weaving

We often use some units of measurement in everyday life to designate land plots. This is a hectare, weaving and macaws.

When solving problems, be sure to pay attention to the units of measurement. Centimeters can only be added to centimeters, and meters can only be added to meters. Therefore, you should always ensure that in the given solution to the problem, all values ​​are expressed in the same units.

💡
In English-speaking countries (USA, Canada, Great Britain, Australia) acres, yards are used to measure land plots. $ 1 acre = 4940 yards = 4046.96 m ^ 2 $.

Example tasks:

# 1. Convert $ 10 m ^ 2 $ to $ cm ^ 2 $

Solution:

• $ 1 m = 100 cm $;
• $ 1 m ^ 2 = 100 x 100 = 10,000 cm ^ 2 $;
• $ 10 m ^ 2 = 10 х 10,000 = 100,000 cm ^ 2 $

# 2. How many $ 500 m ^ 2 $ ares?

Solution:

• $ 100 m ^ 2 = 1 a $;
• $ 500 m ^ 2 = 5 a $.

How are the units of area related to each other?

In order to see the relationship, you need to pay attention to the table.

Area Units Table

What is a weaving, are, hectare, square kilometer? How many hectares, square meters and kilometers are in one area (weave) of land? How many square meters, kilometers and acres are in one hectare of land? How many acres, hectares and square meters are in one square kilometer?

At school, each of us studied the units of measurement of the area of ​​land plots. We knew what are, weaving, hectares, and how many square meters are in them. Many adults today have forgotten how to perform such fairly simple computational operations. It is just such "dunno" that this article will come to the rescue.

How many square meters in 1, 10, 100, 1000 acres: table

• Weaving is a unit of measure for the size of a plot, which is often used in a summer cottage or agriculture. In science, it is customary to use an analog of a hundred square meters - ar.
• Based on the name of this measure, one can already guess that we are talking about hundreds of meters.
• Indeed, one hundred square meters is equal to 100 m2.
• In other words, one hundred square meters will be equal to the area of ​​a square with sides of 10 m.
• Accordingly, there will be 1000 m2 in ten acres.
• 100 acres contains 10,000 m2, and 1000 acres - 100,000 m2.
• In other words, to calculate how many square meters in a given number of acres, you need to multiply the weave by 100.

How many acres in 1, 10, 100 square meters: table

• To calculate how many acres are in square meters, you need to divide the given number of square meters by 100.
• Thus, in 1 m2 there are 0.01 ares, in 10 m2 - 0.1 ares, and in 100 m2 - 1 are.

What is a hectare of land?

• A hectare is a unit of measurement for the size of a plot, which is equal to the area of ​​a square with sides of 100 m. A hectare, like a hundred square meters, is mainly used as measuring units only in agriculture and summer cottages.
• The designation for a hectare looks like "hectare".
• One hectare is equal to 10,000 m2 or 100 acres.

How many square meters in 1, 10, 100, 1000 hectares: table

• In order to calculate how many square meters there are in a given number of hectares, you need to multiply the number of hectares by 10,000.
• Thus, 1 ha has 10,000 m2, 10 ha - 100,000 m2, 100 ha - 1,000,000 m2, and 1,000 ha - 10,000,000 m2.

How many ares in 1, 10, 100, 1000 hectares: table

• To calculate how many acres corresponds to a given number of hectares, you need to multiply the number of hectares by 100.
• So, in 1 ha there are 100 acres, in 10 ha - 1000 acres, in 100 ha - 10,000 acres, and in 1000 ha - 100,000 acres.

How many hectares in 1, 10, 100, 1000, 10000 acres, square meters: table

• To calculate how many hectares are contained in a given number of acres, you need to divide the number of acres by 100.
• And in order to carry out such calculations with square meters, it is necessary to divide their number by 10,000.
• So, in 1 hundredth there are 0.01 hectares, in 10 ares - 0.1 hectares, in 100 ares -1 hectares, in 1,000 ares - 10 hectares, in 10,000 ares - 100 hectares.
• In turn, there are 0.0001 ha in 1 m2, 0.001 ha in 10 m2, 0.01 ha in 100 m2, 0.1 ha in 1000 m2, and 1 ha in 10,000 m2.

How many square kilometers are there in 1 hectare?

• A square kilometer is a unit of measure for the area of ​​a land plot equal to the area of ​​a square with sides of 1000 meters.
• There are 100 hectares in one square kilometer.
• Thus, in order to calculate the number of square kilometers in a hectare, it is necessary to divide the given number by 100.
• So, in 1 hectare there are 0.01 sq. Km.

• Arom is a unit of measurement for the size of a plot, equal to the area of ​​a square with sides of 10 m.
• In other words, ap is equal to one hundred square meters.
• In 1 area, there are 100 m2, 1 weaving, 0.01 hectares, 0.0001 sq. Km.

How many ares are there in one hectare?

There are 100 ares in one hectare, just like a hundred square meters.

Area units: Video

Consider the figure below:

The whole figure consists of 8 squares with a side of 1 cm each.

The area of ​​one such square is called a square centimeter and is written down: 1 cm 2.

The area of ​​the whole figure is 8 cm 2.

Remember!

Area is measured only in square units length. Always check your answers.

In mathematics to find squares of geometric shapes special formulas are used in which the area is denoted by the capital Latin letter "S".

We remind you that the area of ​​a square can be found by multiplying the length of its side by itself.

The unit of area is the area of ​​a unit square. For example, if the length of the side of a square is 1 m, then its area is 1 square meter (1 m 2); if the length of its side is 1 cm, then its area is 1 square centimeter (1 cm 2).

To find the area of ​​a figure, it is compared with a unit square.

How to convert square units

Consider a 1 cm square.

Its area is equal to:

Consider a square with a side of 1 m.

Its area is equal to:

It is known that: 1 m = 100 cm

Let's increase the side of the square equal to 1 m by 10 times. We get a square with
side 10 m.

ar or weaving.

In one are - one hundred square meters.

The word "weaving" is often used in the country house, although it is the same as "ar".

To express ap in cm 2, remember that 1 m 2 = 10,000 cm 2.

Means: 1 ar (weaving) = 100 m 2 = 100 10 000 cm 2 = 1 000 000 cm 2

Let's enlarge the side of the square equal to 10 m by 10 times. We get a square with
side 100 m.

The area of ​​such a square is called. Abbreviated as "ha". But when pronounced aloud, the name is pronounced completely.

Let us express hectare in square meters.

1 ha = 100 m 100 m = 10,000 m 2

Now let's determine how many ares in one hectare.

Means: 10,000 m 2: 100 m 2 = 100 (ar)

To measure large areas, for example, territories of states, continents, use square kilometer... That is, a square with a side of 1 km and
with an area of ​​1 km 2.

For simplicity of calculations, we offer you a table of conversions of square units to help you.

Square unit conversion table

This table will help Convert hectares to sq. meters, hectares to ares and vice versa.