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Yahoo!奇摩知識+ - 分類問答 - 科學常識 - 已解決
Yahoo!奇摩知識+ - 分類問答 - 科學常識 - 已解決 
急!!!!數學高手快幫我國三數學求圓周長及角度?
Nov 23rd 2014, 14:51

7.圓切割線性質：PC^2=PA*PB

9.同一點的切線等長，知PA=PC，得角PAC
因角PAC為弦切角，得弧AC
等弦對等弧，得弧ＡB=弧BC
周角360度，且知弧AC，得弧AB
弦切角DAB=弧AB/2

10.
內心，知各三角形面積比=邊長比，得3：4：5，設為3x、4x、5x
推得三角形為直角三角形
內切圓半徑=(a+b-c)/2=(3x+4x-5x)/2=x
由三角形BIC面積，得12=x*3x/2，得x=
三角形ABC周長=3x+4x+5x=12x=

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