Based on the provided definitions, the definitions correspond to specific geometric concepts. Here is a brief explanation of each one:
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A straight figure that has no thickness and extends infinitely in two opposite directions: This describes a line.
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A straight line that always remains the same distance from another line and, therefore, never intersects it: This describes parallel lines.
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A line that intersects another line at a 90-degree angle: This describes perpendicular lines.
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A part of the circumference of a circle or other curve that measures the distance between two points on a curve: This describes an arc.
To accurately answer your question, I would need to know what figure is being referred to in the image. If it’s a line, the first definition is the precise one. If it’s referring to something else, please provide additional context or details about the figure in question.