已知三角形△ABC是等腰直角三角形,EFMN是正方形,AB=AC=6,求阴影正方形面积?
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分享交流一下我的解题思路:
连接EN、FM
作MD⊥AB NK⊥AC
设S△AEF=a
S△ABC是等腰直角三角形,
S△ABC=9a=½×6×6=18
a=2
S阴=4a=8
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