Yes it is because they must have the same distance between them to be considered contour
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The perpendicular distance between two parallel lines is always the same.
No because contour lines are used in the outlining of different regions and different places vary. So it really depends on the place
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The elevation of a point that falls between two contour lines can be approximately determined by averaging the elevation of those two points. Assuming the point is somewhat halfway between the lines, this can be done by adding the elevations and dividing by two.
Because contour lines make places of equal height.