# Area

##### Article

November 28, 2021 Area is the measure of the extent of a two-dimensional region of a space, that is, the measure of the extent of a surface. As for the other measures of a geometric nature, to be precise, a distinction should be made between the two-dimensional region (set of points) and its area (numerical value associated with the previous one). Often, however, in common speech but also in scientific exhibitions, the term area and the term surface are used interchangeably.

## Area unit of measurement

Various units of measurement have been and still are used for the area. In the past, units were chosen on the basis of local needs and, in particular in the rural world, there were different measures also in neighboring regions. Subsequently, starting from the pushes of the Enlightenment, rational and unifying definitions were given. Here we present the most important units. square meter (m², sometimes misspelled as sq m) - is the unit of the International System of Units (SI) square centimeter (cm²): 1 cm² 0.0001 m² - is the unit of the CGS system ara: 1 a 100 m² (used to measure the extent of land) hectare: 1 ha 100 a 10,000 m² (used to measure the extent of land) day: 1 day 3810 m² (used to measure the extent of land) square kilometer: 1 km² 1,000,000 m² (used for the measurement of medium and large territories: municipal, provincial, regional, national, continental and planetary surfaces) Anglo-Saxon units of measurement (British imperial system and US customary system): square foot: 1 sq. ft 0.09290304 m² square yard: 1 sq. yd 9 sq. ft 0.83612736 m² square mile: 1 sq. mi 2,589,988.1103 m² acre: 1 ac 4.046.8564224 m²

## Areas of plane figures

Rectangle: TO b h {\ displaystyle A bh} (where is it b {\ displaystyle b} is the measure of the length of the base e h {\ displaystyle h} height measurement). Parallelogram: TO b h {\ displaystyle A bh} (where is it b {\ displaystyle b} is the measure of the length of the base e h {\ displaystyle h} the corresponding height measurement). Square: TO L ⋅ L L 2 {\ displaystyle A l \ cdot l l ^ {2}} (where is it L {\ displaystyle l} is the measurement of the side). Rhombus: TO d 1 d 2 2 {\ displaystyle A {\ frac {d_ {1} d_ {2}} {2}}} (where is it d 1 {\ displaystyle d_ {1}} is the measure of the length of the largest diagonal e d 2 {\ displaystyle d_ {2}} the measure of the smallest diagonal). Trapezium: TO ( B. + b ) h 2 {\ displaystyle A {\ frac {(B + b) h} {2}}} (where is it B. {\ displaystyle B} And b {\ displaystyle b} are the measurements of the lengths of the bases and h {\

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