±è§ÎABCD¤¤¡A½uAD¥¦æ½uBC¡A½uAD=7¡A½uCD=11, ¨¤Dµ¥©ó¤G¿ªº¨¤B¡A¨D±è§Îªº¤¤½uªø
12.5°µ¤@Ó¥¦æ¥|Ãä§Î ADCH ¡A¦Ó¥B H ¦b BC ½u¤W¥i¥Hª¾¹D CH = AD = 7¥ý°²³] ¨¤B = x «×¡A«h ¨¤AHC = ¨¤ADC = 2¨¤B = 2x¤S ¨¤BAH = ¨¤AHC - ¨¤ABH = 2x - x = x = ¨¤B ¡÷BH = AH = DC = 11ºî¦X¤Wz¥iª¾¤¤½u= ( AD + BC )/2 = ( AD + BH +HC )/2 = 12.5~THE EHD~
AD/2=3.5 , CD/2=5.5¡î2tanB=tanD=11/7, 11/7/2=11/14=5.5/7¡ï7+3.5=10.5¡Î ¤¤¿³°ê2¥Í §õ¤p§Ì
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°µ¤@Ó¥¦æ¥|Ãä§Î ADCH ¡A¦Ó¥B H ¦b BC ½u¤W¥i¥Hª¾¹D CH = AD = 7¥ý°²³] ¨¤B = x «×¡A«h ¨¤AHC = ¨¤ADC = 2¨¤B = 2x¤S ¨¤BAH = ¨¤AHC - ¨¤ABH= 2x - x= x= ¨¤B¡÷BH = AH = DC = 11ºî¦X¤Wz¥iª¾¤¤½u= ( AD + BC )/2= ( AD + BH +HC )/2= 12.5~THE EHD~¶§©ú°ê¤¤¸êÀu¯Z 201 µL²á§B§B
12.5
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