Question

two lines intersecting at a right angle
form a line.
are parallel.
are perpendicular.
form a ray.

Explanation:

• When two lines intersect at a right - angle (90 degrees), by definition, they are perpendicular.
• If two lines formed a line, they would be collinear (not intersecting at a right - angle).
• Parallel lines do not intersect.
• A ray has one endpoint and extends infinitely in one direction, and two lines intersecting at a right - angle do not form a ray.

Answer:

are perpendicular.