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Why does the length of the parallel decreases towards the pole?
You may be thinking of the distance between lines of longitude. The length of the lines of latitude decrease because the Earth is round, so the length of the line is shorter at the poles than it is at the Equator. The distance between the lines of longitude is shorter as you move toward the poles, again, because the Earth is round. All lines of longitude are the same length.
Why can't you measure distance between lines of longitude?
You can, but the distances are not constant - they are zero at the poles and increase as you go towards the equator.
Does perpendicular lines have a constant distance between them?
No but parallel lines have a constant distance between them
Why is the distance between two longitude lines at the north pole 0?
Because all of the longitudes converge in a single point, at both the north andsouth poles. When you stand at a pole, you're standing on every longitude.
Name that line lines that always have the same distance between them?
parallel lines - they are parallel when the distance between them remains constant
