関連ワード:  parallel lines corresponding angles are congruent    parallel lines alternate interior angles are congruent    when a transversal crosses parallel lines corresponding angles are congruent    if corresponding angles are congruent are the lines parallel    if lines are parallel then corresponding angles are congruent    if parallel lines have a transversal then corresponding angles are congruent    if a transversal intersects two parallel lines then corresponding angles are congruent    corresponding angles are congruent when parallel lines are cut by a transversal    when two parallel lines are cut by a transversal corresponding angles are congruent    corresponding angles are congruent then the lines are parallel  
結果 : parallel lines corresponding angles are congruent