Question

如图,△ABC中,AB*AD=AE*AC,AE=4,AB=8,DE=5,求BC

Answer 1

∵AE*AC=AD*AB,

∴AE/AB=AD/AC,

又∠A=∠A,

∴ΔABC∽ΔAED,

∴AB/AE=DE/BC,

8/4=5/BC,

BC=10.