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

perpendicular lines

Step-by-step explanation:

Two lines that intersect and form right angles are called perpendicular lines. The symbol ⊥ is used to denote perpendicular lines. Two lines, both in the same plane, that never intersect are called parallel lines. Parallel lines remain the same distance apart at all times.

1) is right

step-by-step explanation:

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