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如图,△ABC是边长为1的等边三角形.取BC边中点E,作ED∥AB,EF∥AC,...
如图,△ABC是边长为1的等边三角形.取BC边中点E,作ED∥AB,EF∥AC,得到四边形EDAF,它的面积记作S
1;取BE中点E
1,作E
1D
1∥FB,E
1F
1∥EF,得到四边形E
1D
1FF
1,它的面积记作S
2.照此规律作下去,则S
2011=
.
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C.
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如图,在△ABC中,已知∠A=90°,AB=AC=2,O为BC的中点,以O为圆心的圆弧分别与AB、AC相切于点D、E,则图中阴影部分的面积( )
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