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A shape has line symmetry if folding along a line makes the halves match, and rotational symmetry if turning it less than a full turn leaves it looking the same. Counting the lines of symmetry of a shape is a matter of trying each candidate fold, not eyeballing it.
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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-08 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.