å 为æ£å棱é¥çåºé¢ç§¯ä¸º 12 cm² ï¼ååºè¾¹åè¾¹é¿ä¸º 2â3 cm
æ£å棱é¥ç侧é¢ç§¯ä¸º 24 cm² ï¼åå个侧é¢çé¢ç§¯ä¸º 6 cm ²
å¨â³ABGä¸ï¼GEæ¯ABä¸çä¸å线ï¼é«ï¼ï¼å æ¤ AB * GE / 2 = 6 GE =2â3 cm
å¨â³GOEä¸ï¼GOæ¯æ£±é¥çé«ï¼OE = AB/2 = â3 cm ï¼æ ¹æ®å¾è¡å®çå¯å¾ GO = 3 cm
åæ ¹æ®æ£±é¥ä½ç§¯å ¬å¼ V = 1/3 * åºé¢ç§¯ * é«
= 1/3 * 12 * 3
= 12 cm ³