{"id":325,"date":"2018-12-21T19:34:30","date_gmt":"2018-12-21T10:34:30","guid":{"rendered":"http:\/\/pobimath.synology.me\/wordpress\/?p=325"},"modified":"2018-12-21T19:54:03","modified_gmt":"2018-12-21T10:54:03","slug":"1%ea%b6%8c_%eb%aa%85%ec%a0%9c-5-%ec%9d%b4%eb%93%b1%eb%b3%80-%ec%82%bc%ea%b0%81%ed%98%95%ec%9d%80-%eb%b0%91%ea%b0%81%ec%9d%b4-%ea%b0%99%eb%8b%a4","status":"publish","type":"post","link":"http:\/\/pobimath.synology.me\/wordpress\/archives\/325","title":{"rendered":"1\uad8c_\uba85\uc81c 5 \uc774\ub4f1\ubcc0 \uc0bc\uac01\ud615\uc740 \ubc11\uac01\uc774 \uac19\ub2e4"},"content":{"rendered":"

Proposition 5.<\/a><\/p>\n

In isosceles triangles the angles at the base equal one another, and, if the equal straight lines are produced further, then the angles under the base equal one another.<\/p>\n

\uc774\ub4f1\ubcc0 \uc0bc\uac01\ud615\uc5d0\uc11c \ub450 \ubc11\uac01\uc740 \uc11c\ub85c \uac19\ub2e4. \ubcc0\uc744 \uc5f0\uc7a5\ud558\uba74 \ubc11\uac01 \uc544\ub798\uc5d0 \uc788\ub294 \uac01\ub3c4 \uc11c\ub85c \uac19\ub2e4.<\/p><\/blockquote>\n

\"\"<\/p>\n

\n

$\\triangle ABC$\ub294 $\\overline{AB}=\\overline{AC}$\uc778 \uc774\ub4f1\ubcc0 \uc0bc\uac01\ud615\uc774\ub77c\uace0 \ud558\uc790.<\/p>\n

\uc774\uc81c $\\angle{ABC}=\\angle{ACB}$\uc784\uc744 \ubcf4\uc774\uc790.<\/p>\n

\uba3c\uc800 \ub450 \ubcc0 $\\overline{AB},\\overline{AC}$\uc744 \uc5f0\uc7a5\ud558\uace0 \uadf8 \uc704\uc5d0 $\\overline{AE}=\\overline{AF}$\uc778 \ub450 \uc810 $E$\uc640 $F$\ub97c \uc7a1\ub294\ub2e4.<\/p>\n

$$\\overline{AB}=\\overline{AC}$$<\/p>\n

$$\\overline{AE}=\\overline{AF}$$<\/p>\n

$$\\angle{BAC}=\\angle{CAB}$$<\/p>\n

\uba85\uc81c 4\uc5d0 \ub530\ub77c\uc11c \ub450 \uc0bc\uac01\ud615\uc740 \ud569\ub3d9\uc774\ub2e4.<\/p>\n

$$\\triangle{ABF}\\equiv\\triangle{ACE}$$<\/p>\n

$$\\angle{ABF}=\\angle{ACE}\\tag{1}$$<\/p>\n

\uc774\uc81c $\\triangle BEC$\uc640 $\\triangle CBF$\uc5d0\uc11c<\/p>\n

$$\\overline{BE}=\\overline{CF}\\tag{CN-4}$$<\/p>\n

$$\\overline{CE}=\\overline{BF}$$<\/p>\n

$$\\angle{BEC}=\\angle{CFB}$$<\/p>\n

$$\\triangle{BEC}\\equiv\\triangle{CFB}\\tag{\uba85\uc81c-4}$$<\/p>\n

\ub530\ub77c\uc11c $$\\angle BCE=\\angle CBF\\tag{2}$$<\/p>\n

(1)(2)\uc5d0 \ub530\ub77c\uc11c<\/p>\n

$$\\angle ABF -\\angle CBF=\\angle ACE-\\angle BCE\\tag{CN-4}$$<\/p>\n

\uadf8\ub7ec\ubbc0\ub85c\u00a0 $$\\angle{ABC}=\\angle{ACB}$$<\/p>\n

$\\blacksquare$<\/p>\n

\ucc38\uace0 \ud3c9\uac01\uc774 180\ub3c4\ub77c\ub294 \uc0ac\uc2e4\uc744 \uc4f0\uba74 \uc27d\uac8c \ubcf4\uc77c\u00a0\uc218 \uc788\ub2e4. \ud558\uc9c0\ub9cc \uc720\ud074\ub9ac\ub4dc\ub294 \uba85\uc81c 5\uc5d0 \uc55e\uc11c \ud3c9\uac01\uc774 \ubaa8\ub450 \uac19\ub2e4\ub294 \uc99d\uba85\uc744 \ud558\uc9c0 \uc54a\uc544\uc11c \uc704\uc640 \uac19\uc774 \uc870\uae08 \ubcf5\uc7a1\ud558\uac8c \uc99d\uba85\ud55c \uac83\uc774\ub2e4.<\/p>\n

\uc774 \uba85\uc81c\ub97c \uc99d\uba85\ud558\ub294 \uadf8\ub9bc\uc774 \ub2f9\ub098\uadc0 \ub2e4\ub9ac\ub97c \ub2ee\uc558\ub2e4\uace0\u00a0Pons Asinorum<\/a>\ub85c \ubd80\ub978\ub2e4. ‘\ud3f0\uc2a4 \uc544\uc2dc\ub178\ub8f8’\uc740 \uac04\ub2e8\ud568\uc5d0\uc11c \ud655\uc2e0\uc744, \ub290\ub9bc\uc5d0\uc11c \ube60\ub978 \uc0dd\uac01\uc744, \ubaa8\ud638\ud568\uc5d0\uc11c \ubd84\uba85\ud568\uc744 \ub04c\uc5b4\ub0b4\ub294 \ub2a5\ub825\uc744 \uc2dc\ud5d8\ud558\ub294 \uacb0\uc815\uc801 \ubb38\uc81c\ub97c \uc740\uc720\ud558\ub294 \uc774\ub984\uc774\ub2e4.<\/p>\n

\ud30c\ud478\uc2a4\ub294 \uc0bc\uac01\ud615\uc744 \ub4e4\uc5b4 \uc62c\ub9b0 \ub2e4\uc74c \ub4a4\uc9d1\uc5b4\uc11c \ud3ec\uac1c\ub294 \uac83\uc73c\ub85c \uc99d\uba85\ud588\ub2e4.<\/p>\n

\ubc14\ub85c \uc774\uc5b4\uc9c0\ub294 \uba85\uc81c 6\ub294 \uc774 \uba85\uc81c\uc758 \uc5ed\uc774\ub2e4.<\/p>\n","protected":false},"excerpt":{"rendered":"

Proposition 5. In isosceles triangles the angles at the base equal one another, and, if the equal straight lines are produced further, then the angles under the base equal one another. \uc774\ub4f1\ubcc0 \uc0bc\uac01\ud615\uc5d0\uc11c \ub450 \ubc11\uac01\uc740 \uc11c\ub85c \uac19\ub2e4. \ubcc0\uc744 \uc5f0\uc7a5\ud558\uba74 \ubc11\uac01 \uc544\ub798\uc5d0 \uc788\ub294 \uac01\ub3c4 \uc11c\ub85c \uac19\ub2e4. $\\triangle ABC$\ub294 $\\overline{AB}=\\overline{AC}$\uc778 \uc774\ub4f1\ubcc0 \uc0bc\uac01\ud615\uc774\ub77c\uace0 \ud558\uc790. \uc774\uc81c $\\angle{ABC}=\\angle{ACB}$\uc784\uc744 \ubcf4\uc774\uc790. \uba3c\uc800 … <\/p>\n

\ub354 \ubcf4\uae30 “1\uad8c_\uba85\uc81c 5 \uc774\ub4f1\ubcc0 \uc0bc\uac01\ud615\uc740 \ubc11\uac01\uc774 \uac19\ub2e4”<\/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\/325"}],"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=325"}],"version-history":[{"count":2,"href":"http:\/\/pobimath.synology.me\/wordpress\/wp-json\/wp\/v2\/posts\/325\/revisions"}],"predecessor-version":[{"id":342,"href":"http:\/\/pobimath.synology.me\/wordpress\/wp-json\/wp\/v2\/posts\/325\/revisions\/342"}],"wp:attachment":[{"href":"http:\/\/pobimath.synology.me\/wordpress\/wp-json\/wp\/v2\/media?parent=325"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/pobimath.synology.me\/wordpress\/wp-json\/wp\/v2\/categories?post=325"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/pobimath.synology.me\/wordpress\/wp-json\/wp\/v2\/tags?post=325"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}