¦´Á¼Æ¾Ç¦r·Jªº¾ú¥v (R) Last revision: Aug. 2, 1999 The word RADIAN was coined by Professor James Thomson (a brother of Lord Kelvin) on a final exam he administered on June 5, 1873, at Queens College in Belfast, Ireland (Johnson, page 158). The expressions RADICAL LINE ("Axe Radical"), RADICAL CENTER OF CIRCLES ("Centre radical des cercles"), and other related terms were coined (in French) by Louis Gaultier (Julio González Cabillón). RADIOGRAM appears in a syllabus prepared by Karl Pearson in 1892, according to Stigler [James A. Landau]. RADIUS. The term "radius" was not used by Euclid, the term "distance" being thought sufficient (Smith vol. 2, page 278). According to Smith (vol. 2, page 278), Boethius (c. 510) seems to have been the first to use the equivalent of our "semidiameter." Radius was used by Peter Ramus (1515-1572) in his 1569 publication of P. Rami Scholarium mathematicarum kibri unus et triginti, writing "Radius est recta a centro ad perimetrum" (Smith vol. 2, page 278; DSB; Johnson, page 158). RADIUS OF CURVATURE. | |
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