Based on your question, it seems that there are several definitions provided, likely corresponding to specific geometric figures. However, since you mentioned an image and I cannot see it, I can help clarify the definitions you provided:
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Arc: A part of the circumference of a circle or other curve that measures the distance between two points on the curve.
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Perpendicular Lines: A line that intersects another line at a 90-degree angle.
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Line: A straight figure that has no thickness and extends infinitely in two opposite directions.
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Parallel Lines: A straight line that always remains the same distance from another line and, therefore, never intersects it.
If the figure in the image corresponds to one of these definitions, please specify which figure it is, and I can provide further clarification or confirm the definition.