where is the S?Let R be the smallest convex polygon that contains R? ~~~~~~~~~选b：理由,在等边三角形的外围在做等边三角形时,有两种状态,如图中所标1,2两种状态,像搭积木那样考证,只有如图所示的多边形面积S最小,因为除去正方形及12个三角形的面积之外,只多余了一个等边三角形的面积,其余的放法怎么都会使得多边形的面积除去固定值之外,比一个三角形的面积多.所以,本题所求的面积：S之内,R之外的面积是一个等边三角形的面积：B
On each side of a unit square,an equilateral triangle of sid
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