已知一等腰三角形的底边BC=6cm,面积S=12cm2,求等腰三角形的腰AB的长

已知一等腰三角形的底边BC=6cm,面积S=12cm2,求等腰三角形的腰AB的长.

 


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答案

解:    A点作ADBCD

S=BCAD=12  ,BC=6

AD=4                  1

AB=AC,ADBC

BD=BC=3              2

RtABDAD2+BD2=AB2

AB==5          5

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