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identifying parallel and perpendicular lines
perpendicular lines and parallel lines
parallel lines perpendicular lines
what are parallel and perpendicular lines
determine lines are parallel or perpendicular
find if lines are parallel or perpendicular
identifying parallel and perpendicular lines, perpendicular lines and parallel lines, parallel lines perpendicular lines, what are parallel and perpendicular lines, determine lines are parallel or perpendicular, find if lines are parallel or perpendicular
