<div><img onLoad='miniSelfResize(contents_15,this);' src="download.php?id=mathmovie&no=15&div=0&mode=1" border="0" /></div><br> <P><SPAN>ÆÛÁñ ¸ÂÃ߱⸦ ÅëÇØ »ç°¢ÇüÀÇ ¿Ü°¢ÀÇ Å©±âÀÇ ÇÕÀÌ 360µµ ÀÓÀ» ÇнÀÇÏ´Â ±³±¸ÀÌ´Ù<IFRAME height="315" src="http://www.youtube.com/embed/2e0kyDl3HrI" frameBorder="0" width="560" allowfullscreen=""></IFRAME></SPAN> <P><SPAN></SPAN> </P> <P><SPAN>»ç°¢ÇüÀÇ ¿Ü°¢ÀÇ Å©±âÀÇ ÇÕÀº ¸î µµ°¡ µÉ±î?</SPAN></P> <P><SPAN>»ç°¢ÇüÀÇ ¿Ü°¢À¸¸£ ³ªÅ¸³»´Â Á¶°¢ 4°³¸¦ ¿ø ¾È¿¡ ³Ö¾î º¸ÀÚ.</SPAN></P> <P><SPAN>±³±¸¸¦ °¡Áö°í Á÷Á¢ Á¶°¢µéÀ» ¸ð¾Æ º¸ÀÚ.</SPAN></P> <P><SPAN></SPAN> </P> <P><SPAN>The angle made with an extension of a side and its corresponding adjacent side is the exterior angle. <BR><BR>Therefore, the sum of the interior angle and the exterior angle on a vertex is 180¡Æ. That is, an interior angle and an exterior angle are complementary. </SPAN></P> <P class="main">Put the pieces of exterior angles of each vertex of the quadrilateral into the right circle. </P> <P></P> <P class="main">Now, guess the sum of the exterior angles of a quadrilateral.</P>