{"id":37930,"date":"2026-08-05T04:51:16","date_gmt":"2026-08-05T02:51:16","guid":{"rendered":"https:\/\/xmau.com\/notiziole\/?p=37930"},"modified":"2026-07-24T22:54:16","modified_gmt":"2026-07-24T20:54:16","slug":"il-lemma-di-star-trek","status":"publish","type":"post","link":"https:\/\/xmau.com\/notiziole\/2026\/08\/05\/il-lemma-di-star-trek\/","title":{"rendered":"Il lemma di Star Trek"},"content":{"rendered":"<p><a href=\"https:\/\/i0.wp.com\/xmau.com\/notiziole\/wp-content\/uploads\/sites\/6\/2026\/07\/star-trek.png?ssl=1\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" class=\"alignright size-medium wp-image-37933\" src=\"https:\/\/i0.wp.com\/xmau.com\/notiziole\/wp-content\/uploads\/sites\/6\/2026\/07\/star-trek.png?resize=300%2C300&#038;ssl=1\" alt=\"\" width=\"300\" height=\"300\" srcset=\"https:\/\/i0.wp.com\/xmau.com\/notiziole\/wp-content\/uploads\/sites\/6\/2026\/07\/star-trek.png?resize=300%2C300&amp;ssl=1 300w, https:\/\/i0.wp.com\/xmau.com\/notiziole\/wp-content\/uploads\/sites\/6\/2026\/07\/star-trek.png?resize=200%2C200&amp;ssl=1 200w, https:\/\/i0.wp.com\/xmau.com\/notiziole\/wp-content\/uploads\/sites\/6\/2026\/07\/star-trek.png?w=589&amp;ssl=1 589w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a>Uno dei teoremi di geometria euclidea pi\u00f9 utilizzati \u00e8 quello che afferma che in un cerchio l&#8217;angolo al centro \u00e8 il doppio dell&#8217;angolo alla circonferenza corrispondente: nella figura qui a fianco, l&#8217;angolo\u00a0<em>BOC\u00a0<\/em>\u00e8 il doppio dell&#8217;angolo\u00a0<em>BAC<\/em>.<\/p>\n<p>Il teorema non ha un nome specifico: al pi\u00f9 lo si pu\u00f2 chiamare Euclide III.20, dal numero della proposizione degli\u00a0<em>Elementi<\/em> che lo dimostra. Arthur Baragar, nel suo libro del 2001 <i>A Survey of Classical and Modern Geometrie<\/i><em>s<\/em>, propose di chiamarlo &#8220;Lemma di Star Trek&#8221;, visto che il disegno ricorda il logo della Flotta Stellare. \u00c8 vero che quel logo ha i lati un po&#8217; curvi, ma chi siamo noi per non vedere la somiglianza con questa figura?<\/p>\n<p><small>(<a href=\"https:\/\/www.johndcook.com\/blog\/2026\/06\/24\/star-trek-lemma\/\">fonte<\/a>)<\/small><span hidden class=\"__iawmlf-post-loop-links\" data-iawmlf-links=\"[{&quot;id&quot;:268,&quot;href&quot;:&quot;https:\\\/\\\/www.johndcook.com\\\/blog\\\/2026\\\/06\\\/24\\\/star-trek-lemma&quot;,&quot;archived_href&quot;:&quot;http:\\\/\\\/web-wp.archive.org\\\/web\\\/20260802032323\\\/https:\\\/\\\/www.johndcook.com\\\/blog\\\/2026\\\/06\\\/24\\\/star-trek-lemma\\\/&quot;,&quot;redirect_href&quot;:&quot;&quot;,&quot;checks&quot;:[{&quot;date&quot;:&quot;2026-08-05 02:51:26&quot;,&quot;http_code&quot;:200}],&quot;broken&quot;:false,&quot;last_checked&quot;:{&quot;date&quot;:&quot;2026-08-05 02:51:26&quot;,&quot;http_code&quot;:200},&quot;process&quot;:&quot;done&quot;}]\"><\/span><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Un teorema classico il cui diagramma assomiglia a un logo classico<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_lmt_disableupdate":"","_lmt_disable":"","site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"default","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"set","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center 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Quanto misura l'angolo DLK? (trovate un aiutino sul mio sito, alla pagina http:\/\/xmau.com\/quizzini\/p596.html; la risposta verr\u00e0 postata l\u00ec il prossimo mercoled\u00ec. Problema di Y. 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