In the figure, AD=2cm, AC=4cm and BC=6cm.
If △ABC~△DAC, find
ㄥBAD
有數學唔識
2007-01-25 2:15 am
回答 (2)
2007-01-25 2:30 am
✔ 最佳答案
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
2007-01-25 2:21 am
你要講埋個2個三角形係點? 分開定重疊~? 形容多D~!
收錄日期: 2021-04-13 17:08:33
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