Final answer:
Equidistant in relation to parallel lines means that the two lines maintain the same distance between them consistently. These lines are part of geometry principles and are also relevant in vector discussions and electric fields in physics.
Step-by-step explanation:
The term equidistant in relation to parallel lines means that the two lines have the same distance between them at all points. Parallel lines extend indefinitely, lie in the same plane, and have an infinite number of points, but being equidistant specifically refers to option d: The two lines have the same distance between them. This concept is fundamental in geometry, particularly in the study of shapes, angles, and in the creation of graphical perspective in art.
In contrast, when we talk about vectors, two parallel vectors have the same direction and are equidistant from each other if they lie along two parallel lines. In the context of equipotential lines in physics, these lines are all equidistant from each other and always perpendicular to the direction of the electric field lines.