回複：IBM八月（二星半）

The teacher is smart,he know the unique solution. There only two conditions, so the tringle is isosceles tringle, a,a,b.A did'nt know Cs not knowing area, and got solution after getting area.B got later as thinging longer...A^2=s(s-a)^2*(2a-s)...a=(5/6)s,b=(1/3)s. s should be 6n,...