What defines perpendicular lines?

Perpendicular lines are specifically defined as lines that meet at right angles, which is exactly what the correct answer states. A right angle measures 90 degrees, and when two lines intersect to form this angle, they are considered perpendicular to each other. This geometric property is fundamental in various applications, including building design, engineering, and technical drawings, as it ensures that structures are level and components fit together properly.

Considering the other options, lines that intersect at obtuse angles do not qualify as perpendicular, since obtuse angles are greater than 90 degrees. Lines having equal lengths are unrelated to the concept of perpendicularity, as length does not determine whether two lines will intersect at a right angle. Lastly, curved lines that overlap do not intersect in the same manner as straight lines and therefore cannot be considered perpendicular in the conventional sense used in geometry. This focus on right angles is central to the definition of perpendicular lines.