Surface measurements are directly linked to our daily lives, when buying a lot, painting a wall, whether to tile a floor or tile a wall, the first fact we need to know is the measurement of the area of the surfaces. By the SI (International Measurement System), the standard unit used to express a measure of area is the square meter (m²). The area of a surface is calculated as the product of length and width. The multiples and sub-multiples of the square meter (m²) are:
Multiples: square kilometer (km²), square hectometer (hm²), square dekameter (dam²).
Submultiples: square decimeter (dm²), square centimeter (cm²), square millimeter (mm²).
Surface measurement units can appear in any of the units mentioned, so they can be transformed from one unit to another. This should occur based on the table of transformations shown below:
Turning 2m² into cm² = 2 x 100 x 100 = 20 000 cm²
Turning 1km² into m² = 1 x 100 x 100 x 100 = 1,000,000 m²
Transforming 3hm² into dm² = 3 x 100 x 100 x 100 = 3,000,000 dm²
Transforming 4km² into mm² = 4 x 100 x 100 x 100 x 100 x 100 x 100 = 4 000 000 000 000 mm²
Turning 4m² into dam² = 4: 100 = 0.04 dam²
Turning 100cm² into m² = 100: 100: 100 = 0.01 m²
Transforming 35 000 000m² into km² = 35 000 000: 100: 100: 100 = 35km²
Agrarian Measures
The agrarian measures are related to the land areas and the standard unit is the hectare, which corresponds to 10 000 m². The bushel is also widely used, but its measurement varies according to each state, note:
by Mark Noah
Graduated in Mathematics
Brazil School Team
plane geometry - Math - Brazil School
Source: Brazil School - https://brasilescola.uol.com.br/matematica/conversao-medidas-superficie.htm
