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Define abcd!
Mn: 1s22s22p63s23p63d54s2 Mn2+: 1s22s22p63s23p63d5
The answer will depend on what ABCD is (or are). And since you have not bothered to provide that information, I cannot provide a sensible answer.
To find the perimeter of polygon efgh, you need the ratio of similarity between polygons abcd and efgh, as well as the perimeter of polygon abcd. Once you have the perimeter of abcd, multiply it by the ratio to obtain the perimeter of efgh. If the ratio is not provided, it cannot be determined.
400 square cm