{"id":367,"date":"2018-12-23T11:42:55","date_gmt":"2018-12-23T02:42:55","guid":{"rendered":"http:\/\/pobimath.synology.me\/wordpress\/?p=367"},"modified":"2020-11-11T09:09:16","modified_gmt":"2020-11-11T00:09:16","slug":"1%ea%b6%8c_%eb%aa%85%ec%a0%9c-11-%ec%88%98%ec%84%a0%ec%9d%84-%ec%9e%91%eb%8f%84%ed%95%98%eb%9d%bc","status":"publish","type":"post","link":"http:\/\/pobimath.synology.me\/wordpress\/archives\/367","title":{"rendered":"1\uad8c_\uba85\uc81c 11 \uc218\uc120\uc744 \uc791\ub3c4\ud558\ub77c"},"content":{"rendered":"<blockquote><p><b><a href=\"http:\/\/aleph0.clarku.edu\/~djoyce\/java\/elements\/bookI\/propI11.html\">Proposition 11.<\/a><\/b><\/p>\n<p>To draw a straight line at right angles to a given straight line from a given point on it.<\/p>\n<p>\uc9c1\uc120 \uc704\uc5d0 \uc8fc\uc5b4\uc9c4 \uc810\uc5d0\uc11c \uc218\uc9c1\uc778 \uc9c1\uc120\uc744 \uadf8\uc744 \uc218 \uc788\ub2e4.<\/p><\/blockquote>\n<p>\uc9c1\uc120 $AB$ \uc704\uc758 \uc810 $C$\uac00 \uc8fc\uc5b4\uc84c\ub2e4\uace0 \ud558\uc790.<\/p>\n<p>\uc801\ub2f9\ud55c \uc810 $D$\ub97c \uc7a1\uace0 \uc810 $C$\ub97c \uc911\uc2ec\uc73c\ub85c \ubc18\uc9c0\ub984\uc774 $\\overline{CD}$\uc778 \uc6d0\uc744 \uadf8\ub824 \uc810 $E$\ub97c \ucc3e\ub294\ub2e4.<\/p>\n<p>$\\overline {CD}=\\overline {CE}$\uc778 \ub450 \uc810 $D,E$\ub97c \uc7a1\ub294\ub2e4.<\/p>\n<p>\uc120\ubd84 $ED$\ub97c \ud55c \ubcc0\uc73c\ub85c \ud558\ub294 \uc815\uc0bc\uac01\ud615\uc744 \uadf8\ub824\uc11c \uc810 $F$\ub97c \ucc3e\ub294\ub2e4.<\/p>\n<p><img loading=\"lazy\" class=\"aligncenter size-medium wp-image-368\" src=\"http:\/\/pobimath.synology.me\/wordpress\/wp-content\/uploads\/2018\/12\/Euclid_proposition_11-300x182.png\" alt=\"\" width=\"300\" height=\"182\" srcset=\"http:\/\/pobimath.synology.me\/wordpress\/wp-content\/uploads\/2018\/12\/Euclid_proposition_11-300x182.png 300w, http:\/\/pobimath.synology.me\/wordpress\/wp-content\/uploads\/2018\/12\/Euclid_proposition_11.png 518w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><\/p>\n<p>\uc815\ub9ac 10\uc5d0\uc11c $$\\triangle{FEC}\\equiv\\triangle{FDC}$$<\/p>\n<p>$$\\therefore\\;\\angle{FCE}=\\angle{FCD}$$<\/p>\n<p>\ub450 \uc9c1\uc120\uc774 \ub9cc\ub0a0 \ub54c \uc774\uc6c3\ud55c \ub450 \uac01\uc774 \uac19\uc73c\ubbc0\ub85c \ub450 \uac01\uc740 \ubaa8\ub450 \uc9c1\uac01\uc774\ub2e4.<\/p>\n<p>\uadf8\ub7ec\ubbc0\ub85c \uc9c1\uc120 $CF$\ub294 \uc9c1\uc120 $AB$\uc5d0 \uc218\uc9c1\uc774\ub2e4.<\/p>\n<p style=\"text-align: right;\">$\\blacksquare$<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Proposition 11. To draw a straight line at right angles to a given straight line from a given point on it. \uc9c1\uc120 \uc704\uc5d0 \uc8fc\uc5b4\uc9c4 \uc810\uc5d0\uc11c \uc218\uc9c1\uc778 \uc9c1\uc120\uc744 \uadf8\uc744 \uc218 \uc788\ub2e4. \uc9c1\uc120 $AB$ \uc704\uc758 \uc810 $C$\uac00 \uc8fc\uc5b4\uc84c\ub2e4\uace0 \ud558\uc790. \uc801\ub2f9\ud55c \uc810 $D$\ub97c \uc7a1\uace0 \uc810 $C$\ub97c \uc911\uc2ec\uc73c\ub85c \ubc18\uc9c0\ub984\uc774 $\\overline{CD}$\uc778 \uc6d0\uc744 \uadf8\ub824 \uc810 $E$\ub97c \ucc3e\ub294\ub2e4. $\\overline {CD}=\\overline {CE}$\uc778 \ub450 &hellip; <\/p>\n<p class=\"link-more\"><a href=\"http:\/\/pobimath.synology.me\/wordpress\/archives\/367\" class=\"more-link\">\ub354 \ubcf4\uae30<span class=\"screen-reader-text\"> &#8220;1\uad8c_\uba85\uc81c 11 \uc218\uc120\uc744 \uc791\ub3c4\ud558\ub77c&#8221;<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[4],"tags":[],"_links":{"self":[{"href":"http:\/\/pobimath.synology.me\/wordpress\/wp-json\/wp\/v2\/posts\/367"}],"collection":[{"href":"http:\/\/pobimath.synology.me\/wordpress\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/pobimath.synology.me\/wordpress\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/pobimath.synology.me\/wordpress\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/pobimath.synology.me\/wordpress\/wp-json\/wp\/v2\/comments?post=367"}],"version-history":[{"count":5,"href":"http:\/\/pobimath.synology.me\/wordpress\/wp-json\/wp\/v2\/posts\/367\/revisions"}],"predecessor-version":[{"id":399,"href":"http:\/\/pobimath.synology.me\/wordpress\/wp-json\/wp\/v2\/posts\/367\/revisions\/399"}],"wp:attachment":[{"href":"http:\/\/pobimath.synology.me\/wordpress\/wp-json\/wp\/v2\/media?parent=367"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/pobimath.synology.me\/wordpress\/wp-json\/wp\/v2\/categories?post=367"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/pobimath.synology.me\/wordpress\/wp-json\/wp\/v2\/tags?post=367"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}