6) PQ | RT, PT | RQ и PT ⊥ RT.

This is a geometry problem statement that includes several conditions relating line segments. Let's break down each part:

• PQ | RT: This likely means that line segment PQ is parallel to line segment RT (PQ || RT).
• PT | RQ: This likely means that line segment PT is parallel to line segment RQ (PT || RQ).
• PT ⊥ RT: This means that line segment PT is perpendicular to line segment RT (PT ⊥ RT).

Analysis:

From the given conditions:

• If PQ || RT and PT || RQ, then the quadrilateral PQRT is a parallelogram.
• If PT ⊥ RT, and PQRT is a parallelogram, then all angles in the parallelogram must be right angles. This means PQRT would be a rectangle.

Conclusion:

Based on the provided information, the figure PQRT is a rectangle. If this is a question asking to prove or identify the shape, then the answer would be 'rectangle'. If it's part of a larger problem, these statements serve as given conditions for further calculations or deductions.

Please provide the full question or task if a more specific answer is required.