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Perimeter is the distance all the way round; area is how much surface is covered. For shapes made of rectangles you can cut the shape into rectangles, or count squares. The two are independent: two shapes with the same area can have very different perimeters.
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Nothing. This is one of the skills the Atlas starts from.
No indexed official paper question has been tagged with GEO-01 yet. The index grows one paper at a time, and it records only question numbers, point values and our own skill tags — never the problems themselves.