Answer :
When two lines meet to form a right angle, then the lines are said to be perpendicular to each other.
Therefore, perpendicular lines are defined as lines that meet to form a right angle.
Hence, option (A) is correct.

When two lines meet to form a right angle, then the lines are said to be perpendicular to each other.
Therefore, perpendicular lines are defined as lines that meet to form a right angle.
Hence, option (A) is correct.