関連ワード:  are the opposite angles of a quadrilateral always equal    are the opposite sides of a quadrilateral always equal    are the opposite sides of a square always equal    opposite angles of a quadrilateral are always equal true or false    are the diagonals of a quadrilateral always equal    are the diagonals of a square always equal    are opposite angles in a quadrilateral equal  
結果 : are the opposite angles of a quadrilateral always equal
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