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Cartesian coordinate system with a circle of radius 2 centered at the origin marked in red. The equation of a circle is (x − a)2 + (y − b)2 = r2 where a and b are the coordinates of the center (a, b) and r is the radius. Cartesian coordinates are named for René Descartes, whose invention of them in the 17th century revolutionized ...
Longer texts are best summarised with the full text placed on Wikisource, or given as an external link. If the work is in copyright, then be careful to limit the amount quoted, do not place it on Wikisource, and only link to websites containing it if they have a right to do so. For instance, a band's official site may contain lyrics or videos ...
Descartes number. In number theory, a Descartes number is an odd number which would have been an odd perfect number if one of its composite factors were prime. They are named after René Descartes who observed that the number D = 32⋅72⋅112⋅132⋅22021 = (3⋅1001)2 ⋅ (22⋅1001 − 1) = 198585576189 would be an odd perfect number if ...
A Cube of Sugar. A Cube of Sugar ( Persian: یک حبه قند, Yek Habbeh Ghand or Ye Habbeh Ghand) is a 2011 Iranian drama film directed by Seyyed Reza Mir-Karimi. [2] [3] It had its world premiere at the Busan International Film Festival on 8 October 2011. On 24 September 2012, the film was selected as the Iranian entry for the Best Foreign ...
Descartes. -class cruiser. The Descartes class comprised two protected cruisers of the French Navy built in the early 1890s; the two ships were Descartes and Pascal. They were ordered as part of a naval construction program directed at France's rivals, Italy and Germany, particularly after Italy made progress in modernizing its own fleet.
Plot introduction. Grundy, a man only a few inches high, is desperate to prove himself and gain respect. He volunteers to ride the Monster Under The Bed to find his friend Ivy's long lost dragon, Stanley Steamer. After many adventures, he rescues Rapunzel from the villainous Sea Hag. It seems too good to be true that she could become any size ...
The 2008 Summer Olympics torch relay route involved 21 countries where the Olympic torch was carried between its lighting in Greece in March 2008 and the Olympic opening ceremony in China 's host city of Beijing in August 2008. The relay took place in four separate legs: in Greece, an international leg, in the Special Administrative Region of ...
Text messaging. A text message using SMS – the 160 character limit and difficulty of typing on feature phone keypads led to the abbreviations of "SMS language". The word "lol" sent via iMessage. Text messaging, or texting, is the act of composing and sending electronic messages, typically consisting of alphabetic and numeric characters ...