Based on the descriptions provided, it seems you are asking for definitions of geometric figures. Here’s the precise definition for each statement given:
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Arc: A part of the circumference of a circle or other curve that measures the distance between two points on a curve.
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Line: A straight figure that has no thickness and extends infinitely in two opposite directions.
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Perpendicular Line: A line that intersects another line at a 90-degree angle.
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Parallel Line: A straight line that always remains the same distance from another line and, therefore, never intersects it.
If you are seeking to identify a specific figure in an image, please let me know which definition aligns with that figure!