å¨æ£±æ±çåç±»ä¸æ两ç§ï¼ä¸ç§æ¯æåºé¢å¤è¾¹å½¢çè¾¹æ°è¿è¡åç±»ï¼å¦åºé¢å¤è¾¹å½¢æ¯
ä¸è§å½¢ï¼å边形ï¼äºè¾¹å½¢ççï¼å¯¹åºç棱æ±å°±å«
ä¸æ£±æ±ãå棱æ±ãäºæ£±æ±ççï¼å¦ä¸ç§å类就æ¯æ侧é¢ä¸åºé¢æ¯å¦åç´æ¥åç±»ï¼ä¾§é¢ä¸ä¸åºé¢åç´ç棱æ±å«æ棱æ±ï¼ä¾§é¢ä¸åºé¢åç´ç棱æ±å«ç´æ£±æ±ã
ä½ æåºçé®é¢ï¼å
棱æ±ä¸æ¯ä¸æ£±æ±ï¼å°±æ¯æåºé¢å¤è¾¹å½¢çè¾¹æ°åç±»å½åçï¼å°±æ¯åºé¢æ¯
å
边形ï¼ä¸æ¯ä¸è¾¹å½¢ï¼æ以æ¯å
棱æ±ã