Based on the descriptions provided, it seems that the definitions correspond to different geometric concepts.
- "a straight figure that has no thickness and extends infinitely in two opposite directions" describes a line.
- "a line that intersects another line at a 90-degree angle" describes a perpendicular line.
- "a straight line that always remains the same distance from another line and, therefore, never intersects it" describes parallel lines.
- "a part of the circumference of a circle or other curve that measures the distance between two points on a curve" describes an arc.
To determine the precise definition of the figure in the image, you would need to identify which description matches the figure shown. If you have more context or details about the image, I could help narrow it down further!