已知:如图,EF//AD,∠1=∠2,∠BAC=70°,请将求∠AGD 的过程补充完整.![](http://tikupic.21cnjy.com/e9/f3/e9f36f158547fb7f7fc2a9845ea9b0f5.png)
解:∵EF//AD
∴∠2= {#blank#}1{#/blank#} ({#blank#}2{#/blank#})
∵∠1=∠2 ∴∠1=∠3 ({#blank#}3{#/blank#})
∴AB// {#blank#}4{#/blank#}({#blank#}5{#/blank#})
∴∠BAC+ {#blank#}6{#/blank#} =180° ({#blank#}7{#/blank#} )
∵∠BAC=70° ∴∠AGD= {#blank#}8{#/blank#}.