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绛旓細鍕捐偂瀹氱悊 鈭碅C=5 鈭礎C²+AD²=5²+12²=25+144=169=13²=CD²鈭次擜CD鏄洿瑙掍笁瑙掑舰 鍕捐偂閫嗗畾鐞 鍗斥垹CAD=90º鈭碨鍥涜竟褰BCD =S螖ABC+S螖ACD =3脳4/2+5脳12/2 =6+30 =36
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绛旓細鐩村緞180鍘樼背闀2绫虫眰浣撶Н鏄 3.14脳(180/2)²脳2 锛3.14脳8100脳2 锛25434脳2 锛50868绔嬫柟鍘樼背 1鏍瑰渾鏈ㄩ暱12绫筹紝澶уご鐩村緞1锛32M灏忓ご鐩村緞1锛26m姹傚叾浣撶Н? {锛1,32/2锛² 蟺+锛1,26/2² 蟺锛墋/2x12 =锛1,3685+1,2469锛/2x12 =1,3077x12 =15,6923m...
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