vbd391t的部落格

標題:

有數學唔識

發問:

In the figure, AD=2cm, AC=4cm and BC=6cm. If △ABC~△DAC, find ㄥBAD 更新: 分開的

最佳解答:

Because △ABC~△DAC CD/CA= CA/CB CD/4 cm= 4/6 CD= 8/3 cm AB/DA=CB/CA AB/2 cm= 6/4 AB= 3 cm You can use cosine law to calculate ㄥBAC and ㄥCAD ㄥBAD depends how the figure is drawn (I hope you have the figure from your homework), Either ㄥBAD= ㄥBAC+ㄥCAD or ㄥBAD= ㄥBAC-ㄥCAD Cosine Law: http://www.cut-the-knot.org/pythagoras/cosine.shtml

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其他解答:

你要講埋個2個三角形係點? 分開定重疊~? 形容多D~!