图呢?-----------------------延长BC至C',使CC'=AD,连DC'则ADC'C是平行四边形DC'=DB,DC'//AC所以,BDC'是等腰直角三角形BC'=AD+BC=16BD=BC'/√2梯形的高=BDC'的高=BD/√2=BC'/2=16/2=8
咋没图呀？!
