三角形面積

2007-11-24 11:09 pm
三角形ABC是一個等邊三角形,
D點是三角形ABC中的一點,
AD=3,BD=5,CD=4
求三角形ABC的面積

回答 (3)

2007-11-24 11:29 pm
✔ 最佳答案
(1+1) (square root3) (0.5)=area

2007-11-24 15:50:14 補充:
I get something like this,AB^2=3^2 5^2-2(5)(3)(cosADB)AB=BC=ACsinADB/AB=sinADC/AC

2007-11-24 15:56:31 補充:
The area is in ratio?Similar Triangles

2007-11-24 16:06:35 補充:
3/4=4/5=3/515/20=16/20=12/20This shows that they are in ratio, similar triangles.
2007-11-24 11:27 pm
底乂高
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2
2007-11-24 11:18 pm
D點是三角形ABC中的一點.......邊一條邊上......


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