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The article suggests that the hectare is used in place of the square meter where it 'would be cumbersome and unnecessarily precise' to do so (added here). But surely units could be given as 270,000 sq m. rather than 27ha which is equally precise and not particularly cumbersome. My view, on the basis of no hard facts at all is that the hectare is a historical hangover used predominantly in countries which transitioned from the imperial acre to the quasi-metric hectare. But I could of course be totally wrong? orizon 03:09, 21 June 2007 (UTC)
Google search shows (1) that both "hectare" and "acre" are widely used in Canada, (2) "hectare" is slightly more common, (3) "hectare" is almost universally preferred in official (government) publications and widely preferred in journalism and education, (4) "acre" is widely used in commercial contexts, notably real estate. Avt tor 23:33, 30 July 2007 (UTC)
Not true! I am a Canadian who uses hectares every day in the measurement of urban parks. Officially no one used acres. mkevlar 30 January 2016 (UTC)
BIPM have moved on. The 8th edition of SI has brought the hectare in from the cold and includes it in a group of units that are accepted for use with SI. (Table 6). The article text as it stands reflects some of the 7th edition, has been edited several times and reads awkwardly. I intend to update the article to reflect the current standing of hectare in SI by BIPM. Bleakcomb (talk) 03:42, 2 April 2008 (UTC)
Square kilometers, as in square miles, are too large for such close resolution tasks in the needs of daily life, and square meters or square yards or feet too large.
Is it possible that the last word of the first paragraph should have been 'small'?
Muddyork (talk) 05:23, 26 June 2008 (UTC)
Please see Talk:Decare. ANDROS1337 22:30, 5 July 2008 (UTC)
Areas less than one hectare are often expressed in square metres, and areas 10,000 ha and above in square kilometres. The number of significant figures is often limited to four digits.[citation needed]
Several people have had a go at these sentences and they don't seem to be improving. The often is weak and borders on a weasel word. It is the equivalent of it often rains, which is quite true but very vague. And the reverse of the limits given is often true as well - areas less than one hectare and greater than 10,000 ha are often expressed in hectares. The problem is probably that the sentence is just POV. By the way here are some examples of hectares in use (even millions of hectares). [1]and [2]--Bleakcomb (talk) 09:48, 26 November 2008 (UTC)
As one of the first year entry to college undertaking Building Construction we were amougst the first students to be educated under the METRIC ACT for the UK. We were told that this Act was past into law in 1972.
I do not have a copy of this law now, so many years on, but I know I had one and all my working life in Building Design within the Civil Service we used the METRIC SYSTEM.
So what's this talk about it coming into effect as late as 1995. This country has been metricated since 1972.
For verification see METRIC ACT 1972.
John McNamara —Preceding unsigned comment added by 86.157.226.86 (talk) 10:29, 29 March 2010 (UTC)
I removed the Tomna form the list of synonyms for the decare as it is defined as being about 1124 square metres (see Maltese units of measurement. References for the other units of measure appear in the relevant Wikipedia articles. Martinvl (talk) 13:24, 16 November 2010 (UTC)
The image http://en.wikipedia.org/wiki/File:Hectare.png illustrates that one are is equal to 10m^2 and that a hectare is equal to 100m^2, when in fact an are is 100m^2 and a hectare, as the article states, is 10000m^2. I think the person who produced the image does not understand what m^2 means. —Preceding unsigned comment added by 82.38.204.141 (talk) 00:46, 27 March 2011 (UTC)
I get the feeling that there is a confusion between when something is x square metres and when something is x metres squared. —Preceding unsigned comment added by 82.38.204.141 (talk) 01:41, 27 March 2011 (UTC)
(Same guy from before). My bad —Preceding unsigned comment added by 82.38.204.141 (talk) 10:23, 27 March 2011 (UTC)
I don’t know how useful this information is or how best (if at all) to incorporate it into this article, but this list was at 1 E+4 m² before it redirected to here.
To help compare orders of magnitude of different areas, areas between 1 hectare (10,000 m²) and 10 hectares (0.1 km²) are listed below.
- Areas smaller than 1 hectare
- 1 hectare is equal to:
- 1.2126 hectares -- Plaza Mayor of Madrid[1]
- 1.35 hectares -- Piazza del Popolo, Rome[1]
- 2.3 hectares -- Red Square, Moscow[1]
- 2.68 hectares—area of the RMS Queen Mary 2's passenger decks
- 3.2 hectares -- Palace of Westminster
- 3.76 hectares -- Castelmoron-d'Albret, the smallest commune of France
- 4 hectares -- Fort Severn, the first campus of the US Naval Academy
- 4.5 hectares -- Wenceslas Square, Prague[1]
- 5.5 hectares—base of the Great Pyramid of Giza
- 5.7 hectares -- Plaza de la Constitución, Mexico City
- 6 2⁄3 hectares—1 Chinese qǐng
- 8.055 hectares -- Charles Square, Prague[1]
- 8.4 hectares -- Place de la Concorde, Paris
- Areas larger than 10 hectares
—Frungi (talk) 04:27, 30 November 2012 (UTC)
Referring to Martinvl's reversion of the graphic on the right on the grounds of "Doesn't add anything to the article apart from overload the graphics", I beg to differ that it helps the reader to compare the unit with other units of area. I agree that there are perhaps already too many pictures on the page, but I think some of them are less useful, e.g. the Statue of Liberty one. Does anyone have any opinion on this? Thanks, cmɢʟee୯ ͡° ̮د ͡° ੭ 19:05, 21 August 2013 (UTC)
Although a good article, I could not find here an answer to my question: how is a piece of land REALLY measured in hectares? What I mean is that all the examples you give are "flat"; what would be appreciated is an example of a non-flat surface: what happens there? Is an "hectare" of flat land equal in terrain size to an "hectare" of slopped land or not? A.R. (alainr345) If it's not clear, for an example of what I mean, I could find this sentence on a website which seems to point to the answer being "No, it would be different in terrain size", but that applies to the term Acre: "The acre is not a measure of surface area on the actual surface of the earth, but on an imaginary, hill-less, standardized ellipsoid. That result comes from using only strictly horizontal dimensions in calculating acreage." — Preceding unsigned comment added by 205.151.119.119 (talk) 22:56, 16 March 2014 (UTC)
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As of May 2018, Google calculator recognizes "ha" in calculations with explicit units, but does not recognize ha with any metric prefix (e.g. k, M). This article doesn't seem to indicate that metric prefixes are accepted with ha, either. Coincidence, or French conspiracy? — MaxEnt 20:51, 21 May 2018 (UTC)
Today, User:DeFacto made a number of edits to this content page, the first of which deleted practically all examples with the mention "Removed illustrated examples per WP:NOTTEXTBOOK". Well, under WP:NOTTEXTBOOK I find, among others, the following sentence:
IMHO, the above-mentioned deletion went too far, removing many examples meant more to inform than to instruct. I'm reminded of the sentence which Pierre Larousse wrote on the half-title page of his dictionary: Un dictionnaire sans exemples est un squelette ("A dictionary without examples is a skeleton"). — Tonymec (talk) 11:25, 13 October 2019 (UTC)
The History section of the article cites a source which contains the text of the law from 1795 [3](in French). That law from 1795 explicitly extended the deadline for the usage of the system of units to become mandatory, which was given by the decree from 1 August 1793. Therefore the first legal definition was in 1793. But most units defined on the 1795 law differ from what was defined on the 1793 decree, particularly on pages 6 and 7. "DECRÈT N.º 1393 DE LA CONVENTION NATIONALE Du 1.er Août 1793" (in French). Paris: IMPRIMERIE NATIONALE EXECUTIVE DU LOUVRE. 1793.
Notably, the meter was already the key unit, so it was a metric system, but the names of several other units were different and while the are was defined as a unit of area, it was defined as 10000 m², or 100 larger, but there was an inconsistence in the conversion factor to square feets which would effectively divide it by a factor of 100.
Is the 1793 system considered to be a different system or already the metric system, but later modified? Does any one knows more about the subject or has another source which comments on the differences? And lacking that, is it still possible, or relevant to mention any of this? Nativeblue (talk) 23:15, 9 October 2022 (UTC)
While some deletionist editors have a problem with "too many photos" in this article, I can't see any problem, because, according to me, there are no too many photos here, and the border between "enough" and "too many" is vague, subjective and arbitrary. All those "too many photos" help many readers, including me, to understand the comparison between different units of area, so please, do not delete photos just because of phobia of "too many" (too many photos, too many planets in the Solar System, too many chemical reactions, too many examples, too many ((clarify)) tags, too many sections, too many list entries, too many table rows, too many tables, too many information, ...), truncating the important information on Wikipedia. Bernardirfan (talk) 15:57, 25 September 2023 (UTC)
The symbol ㏊ redirects to this article. Can someone add a paragraph about the Unicode usage please?
Simon de Danser (talk) 11:53, 8 October 2023 (UTC)
I added a non-metric approximation for the decimilliare; its use of two prefixes is confusing. TooManyFingers (talk) 16:03, 26 October 2023 (UTC)