関連ワード:  are opposite sides of a quadrilateral always congruent    are opposite angles of a quadrilateral always congruent    are the opposite sides of a quadrilateral always sometimes or never congruent    are diagonals of a square always congruent    ron claims that the opposite sides of a quadrilateral are always congruent    are the opposite sides of a quadrilateral always equal  
結果 : are opposite sides of a quadrilateral always congruent
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