Question

请将步骤写完整写，急需高人帮助！

Answer 1

1. <B = <BAD = <C, <BDA = <DAC + <C = <DAC + <BAD = <A, 所以两个等腰三角形的顶角相等，所以相似
2. BD/AB = AB /BC, BC = AB^2 / BD = 24/3根号（2）= 4根号（2）

Answer 2

1）∵AB=AC,AD=BD
∴∠B=∠ACB=∠DAB
△ABC∽△DBA

2）∵△ABC∽△DBA
∴BC/AB=AB/BD
BC=AB²/BD=4√2