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Millimetres would be better, as centimetres would be too long for a short ladybird (UK name).
In Excel, you use the asterisk, "*". As to the name, I would just call it the "multiplication sign".
You would use area. I would use the meter2. Okay
Most mathematicians would refer to that as a 242-gon. If you prefer, you can use dihectodotetracontagon, but it's pretty ugly.
If I was you i would use millimetres or centimetres.