三角形面積

(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.

底乂高
-----------
2

D點是三角形ABC中的一點.......邊一條邊上......