8.
底面为菱形的直棱柱\(ABCD{-}A_{1}B_{1}C_{1}D_{1}\)中,\(E\)、\(F\)分别为棱\(A_{1}B_{1}\)、\(A_{1}D_{1}\)的中点.
\((i)\)在图中作一个平面\(\alpha\),使得\(BD{⊂}\alpha\),且平面\(AEF{/\!/}\alpha{,}(\)不必给出证明过程,只要求作出\(\alpha\)与直棱柱\(ABCD{-}A_{1}B_{1}C_{1}D_{1}\)的截面\()\)
\((ii)\)若\(AB{=}AA_{1}{=}2{,}{∠}BAD{=}60^{{∘}}\),求平面\(AEF\)与平面\(\alpha\)的距离\(d\).