∵E、F、G、H分别是AD、AB、BC、CD的中点, ∴EF∥BD,EH∥AC,GH∥BD,FG∥AC,EF=1 2 BD,EH=1 2 AC, ∴EH∥FG,EF∥GH, ∴四边形EFGH是平行四边形, ∵等腰梯形ABCD,AD∥BC,AB=CD, ∴AC=BD, ∴EF=EH, ∴平行四边形EFGH是菱形, ∵EF∥BD,EH∥AC,AC⊥BD, ∴EF⊥EH, ∴∠FEH=90° ∴菱形EFGH是正方形.
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