The munber of diagonals that can drawn i a regular polygon with twenty sides is______

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The munber of diagonals that can drawn i a regular polygon with twenty sides is______
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The munber of diagonals that can drawn i a regular polygon with twenty sides is______
The munber of diagonals that can drawn i a regular polygon with twenty sides is______

The munber of diagonals that can drawn i a regular polygon with twenty sides is______
正四边形的边长为20 则对角线为___ 答案是 20根号2