California Assessment of Student Performance and Progress (CAASPP) Math Practice Exam

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What is the definition of perpendicular lines?

  1. Lines that do not meet

  2. Lines that always run parallel to each other

  3. Lines that intersect to form at least one right angle

  4. Lines that are curved

The correct answer is: Lines that intersect to form at least one right angle

Perpendicular lines are defined as lines that intersect at a right angle, which is an angle measuring 90 degrees. This specific characteristic distinguishes perpendicular lines from other types of lines. When two lines meet to form at least one right angle, they are classified as perpendicular. This relationship is fundamental in geometry, particularly when analyzing shapes, angles, and various properties of figures. While some of the other definitions might describe different relationships between lines, they do not capture the essence of perpendicularity. For instance, lines that do not meet are classified as parallel or non-intersecting, and lines that run parallel to each other maintain a consistent distance apart, never meeting. Curved lines, on the other hand, do not fit within the definition of straight, intersecting lines.

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