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20-619: The parish of Ystradyfodwg covered a vast area of 10,127 Hectares , but only had 542 inhabitants in 1801. It stretched from the confluence of the Rhondda rivers at Porth , over the mountain as far as the Vale of Neath . It was divided into four townships : The small village of Ystradyfodwg was centred on its parish church, at the site now occupied by the church of St John the Baptist in Ton Pentre . Prior to

40-661: A dash ; for example, 1-21-00.26 ha would mean 1 hectare, 21 ares, and 0.26 centiares (12,100.26 m ). The metric system of measurement was first given a legal basis in 1795 by the French Revolutionary government. The law of 18 Germinal, Year III (7 April 1795) defined five units of measure: In 1960, when the metric system was updated as the International System of Units (SI), the are did not receive international recognition. The International Committee for Weights and Measures ( CIPM ) makes no mention of

60-404: A double prefix is non-standard. The decimilliare is (100 mm) or roughly a four-inch-by-four-inch square. The centiare is one square metre. The deciare (rarely used) is ten square metres. The are ( / ɑːr / or / ɛər / ) is a unit of area, equal to 100 square metres ( 10 m × 10 m ), used for measuring land area. It was defined by older forms of the metric system , but

80-439: A few other units including the are (and implicitly the hectare ) whose use was limited to the measurement of land. The names centiare , deciare , decare and hectare are derived by adding the standard metric prefixes to the original base unit of area, the are . The decimilliare (dma, sometimes seen in cadastre area evaluation of real estate plots) is 1 ⁄ 10,000 are or one square decimetre. Such usage of

100-542: A measure of land area. The names of the older land measures of similar size are usually used, redefined as exactly one decare: The most commonly used units are in bold . One hectare is also equivalent to: The Unicode character U+33CA ㏊ SQUARE HA , in the CJK Compatibility block, is intended for compatibility with pre-existing East Asian character codes. It is not intended for use in alphabetic contexts. U+3336 ㌶ SQUARE HEKUTAARU

120-547: A mile further down the line to the east. A local government district , governed by a local board, was established in 1877 covering most of the parish of Ystradyfodwg, but excluding the Rhigos area. The district was enlarged in 1879 to cover parts of the neighbouring parishes of Llanwonno and Llantrisant . The Ystradyfodwg Local Board built itself a headquarters on Llewellyn Street in Pentre in 1884. The local government district became

140-439: Is a non-SI metric unit of area equal to a square with 100- metre sides (1 hm ), that is, 10,000 square metres (10,000 m ), and is primarily used in the measurement of land. There are 100 hectares in one square kilometre. An acre is about 0.405 hectares and one hectare contains about 2.47 acres. In 1795, when the metric system was introduced, the are was defined as 100 square metres , or one square decametre , and

160-451: Is now outside the modern International System of Units (SI). It is still commonly used in speech to measure real estate, in particular in Indonesia, India, and in various European countries. In Russian and some other languages of the former Soviet Union , the are is called sotka (Russian: сотка : 'a hundred', i.e. 100 m or 1 ⁄ 100 hectare). It is used to describe

180-618: The are in the 2019 edition of the SI brochure, but classifies the hectare as a "Non-SI unit accepted for use with the International System of Units". In 1972, the European Economic Community (EEC) passed directive 71/354/EEC, which catalogued the units of measure that might be used within the Community. The units that were catalogued replicated the recommendations of the CGPM, supplemented by

200-784: The 19th century, the population of the parish increased as follows: Lower-quality coal from the Upper Coal series was worked in a small way in Trealaw as early as 1807, but the development of the Rhondda steam coal gave rise to the rapid population growth. The development began with the start-up of the Bute Merthyr colliery in Treherbert in 1855. In the Rhondda Fach, the first coal was mined in 1862 at Ferndale . The Taff Vale Railway reached Treherbert in 1856. Collieries then rapidly developed along

220-458: The SI, being equivalent to a square hectometre. It is widely used throughout the world for the measurement of large areas of land, and it is the legal unit of measure in domains concerned with land ownership, planning, and management , including law ( land deeds ), agriculture, forestry , and town planning throughout the European Union , New Zealand and Australia (since 1970). However,

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240-996: The United Kingdom, the United States, Myanmar (Burma), and to some extent Canada, use the acre instead of the hectare for measuring surface or land area. Some countries that underwent a general conversion from traditional measurements to metric measurements (e.g. Canada) required a resurvey when units of measure in legal descriptions relating to land were converted to metric units. Others, such as South Africa, published conversion factors which were to be used particularly "when preparing consolidation diagrams by compilation". In many countries, metrification redefined or clarified existing measures in terms of metric units. The following legacy units of area have been redefined as being equal to one hectare: In Mexico, land area measurements are commonly given as combinations of hectares, ares, and centiares. These are commonly written separated by

260-561: The Ystradyfodwg Urban District in 1894, when the parish boundaries were also adjusted to match the urban district. In 1897 the Ystradyfodwg Urban District Council formally changed the name of the parish and urban district from Ystradyfodwg to Rhondda . The area would become better known in the mid 19th century a dynamic centre of the coal mining industry, with a large, new industrial population. During

280-506: The dekare/decare daa (1,000 m ) and are (100 m ) are not officially "accepted for use", they are still used in some contexts. The hectare ( / ˈ h ɛ k t ɛər , - t ɑː r / ), although not a unit of SI, is the only named unit of area that is accepted for use with SI units . The name was coined in French, from the Latin ārea . In practice the hectare is fully derived from

300-469: The hectare (" hecto- " + "are") was thus 100 ares or 1 ⁄ 100  km (10,000 square metres). When the metric system was further rationalised in 1960, resulting in the International System of Units ( SI ), the are was not included as a recognised unit. The hectare, however, remains as a non-SI unit accepted for use with the SI and whose use is "expected to continue indefinitely". Though

320-502: The industrial revolution, Ton Pentre (then just called Ton) was a hamlet a short distance to the west of Ystradyfodwg, but as Ton grew it absorbed the older village. A railway station opened at Ystradyfodwg in 1861 on the Taff Vale Railway 's Rhondda branch line , with the station initially called Ystrad. It was renamed Ystrad Rhondda in 1930, and renamed Ton Pentre in 1986 when a new Ystrad Rhondda railway station also opened about

340-450: The population of the parish was Welsh-speaking in 1891. In 1877, the Hamlet of Rhigos was made a separate civil parish, and the remainder of Ystradyfodwg, together with the adjoining Rhondda valley portions of the parishes of Llanwonno and Llantrisant , became the urban sanitary district of Ystradyfodwg. This extended district became Ystradyfodwg Civil Parish and Urban District in 1894, and

360-580: The size of suburban dacha or allotment garden plots or small city parks where the hectare would be too large. Many Russian dachas are 6 ares in size (in Russian, шесть соток ). The decare or dekare ( / ˈ d ɛ k ɑːr , - ɛər / ) is derived from deca and are , and is equal to 10 ares or 1000 square metres. It is used in Norway and in the former Ottoman areas of the Middle East and Bulgaria as

380-448: The valley, with the lower part of the valley developing last because of the deeper pits required to find the steam coal in that area. By the end of the century, mining villages formed an almost continuous urban strip along both valley floors, with coal mining and its ancillary trades virtually the sole industry. The majority of the incomers came from West Wales , particularly Carmarthenshire and Ceredigion and spoke Welsh . Over 70% of

400-553: Was renamed Rhondda Civil Parish and Urban District in 1897. See Rhondda (district) . This article incorporates text from a publication now in the public domain :  Wood, James , ed. (1907). The Nuttall Encyclopædia . London and New York: Frederick Warne. {{ cite encyclopedia }} : Missing or empty |title= ( help ) 51°38′58″N 3°29′12″W  /  51.64944°N 3.48667°W  / 51.64944; -3.48667 Hectare The hectare ( / ˈ h ɛ k t ɛər , - t ɑːr / ; SI symbol: ha )

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