如图,D为BC的中点,DF⊥AB于F点,DE⊥AC于E点,且DE=DF,则Rt△ {#blank#}1{#/blank#}≌Rt△ {#blank#}2{#/blank#},根据: {#blank#}3{#/blank#};Rt△ {#blank#}4{#/blank#}≌Rt△ {#blank#}5{#/blank#},根据: {#blank#}6{#/blank#};还有△ {#blank#}7{#/blank#}≌△ {#blank#}8{#/blank#},且△ABD为 {#blank#}9{#/blank#}三角形,△ABC为 {#blank#}10{#/blank#}三角形.
![](http://tikupic.21cnjy.com/ef/bc/efbc7723a1b7f02266398af0aee3e869.png)