The precise definition of the figure you're describing would depend on the figure itself. Based on the options provided, here are the definitions aligned with common geometric terminology:
- A straight figure that has no thickness: This describes a line.
- A line that intersects another line at a 90-degree angle: This describes a perpendicular line.
- A part of the circumference of a circle or other curve that measures the distance between 2 points: This describes an arc.
- A line that always remains the same distance from another line and never intersects: This describes (a) parallel lines.
If you have a specific figure in mind, please provide details or clarify your question for a more accurate definition!