関連ワード:  do adjacent angles in a trapezium add up to 180    do opposite angles in a trapezium add up to 180    do opposite angles in a quadrilateral add up to 180    do opposite angles in a cyclic quadrilateral add up to 180    do opposite angles in a quadrilateral always add up to 180    do opposite angles of a trapezoid add up to 180    do opposite angles in a trapezium add to 180    are opposite angles in a trapezium add up to 180    opposite angles in a quadrilateral add up to 180    do opposite angles in a quadrilateral add to 180  
結果 : do adjacent angles in a trapezium add up to 180
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