area
Area is the quantity that expresses the extent of a region on the plane or on a curved surface. The area of a plane region or ''plane area'' refers to the area of a shape or planar lamina, while '' surface area'' refers to the area of an ope ...
, equal to 400 square metres (20 m × 20 m), used for measuring land or property area. Its current size is precisely derived from the
metre
The metre (British spelling) or meter (American spelling; see spelling differences) (from the French unit , from the Greek noun , "measure"), symbol m, is the primary unit of length in the International System of Units (SI), though its prefi ...
, but is neither part of nor recognized by the modern
metric system
The metric system is a system of measurement that succeeded the decimalised system based on the metre that had been introduced in France in the 1790s. The historical development of these systems culminated in the definition of the Interna ...
rai
RAI – Radiotelevisione italiana (; commercially styled as Rai since 2000; known until 1954 as Radio Audizioni Italiane) is the national public broadcasting company of Italy, owned by the Ministry of Economy and Finance. RAI operates many ter ...
or 100 tarang wa ( th, ตารางวา) ''aka'' square wa ( th, วา), very nearly 1/10 of an acre. ''Ngan'' also means ''work''.
It is commonly used in
Thailand
Thailand ( ), historically known as Siam () and officially the Kingdom of Thailand, is a country in Southeast Asia, located at the centre of the Indochinese Peninsula, spanning , with a population of almost 70 million. The country is b ...
and equals four are, another unit based on the metre and as commonly used in several countries recognized though not encouraged by the SI.
As for many terms normally written in
Thai alphabet
The Thai script ( th, อักษรไทย, ) is the abugida used to write Thai, Southern Thai and many other languages spoken in Thailand. The Thai alphabet itself (as used to write Thai) has 44 consonant symbols ( th, พยัญชน ...
, transliteration into English language caused a spelling variant, ''ngaan''.
See also
*
Thai units of measurement
Thailand adopted the metric system on 17 December 1923.1 E+2 m² for a comparison with other areas