Question

why why does the length of parallels decreases the poles

Answer 1

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.

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