Question

define perpendicular lines.
a. lines that cut across two or more lines
b. two coplanar lines that do not intersect
c. two coplanar lines that intersect at a 90 - degree angle
d. two non - coplanar lines that do not intersect

Explanation:

To determine the correct definition of perpendicular lines, we analyze each option:

• Option A: Lines that cut across two or more lines are transversals, not perpendicular lines.
• Option B: Two coplanar lines that do not intersect are parallel lines, not perpendicular.
• Option C: By definition, perpendicular lines are two coplanar lines that intersect at a 90 - degree (right) angle.
• Option D: Two non - coplanar lines that do not intersect are skew lines, not perpendicular.

Answer:

C. Two coplanar lines that intersect at a 90 - degree angle