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The perimeter is doubled.
It is increased by x sqrt(2).
No. However, if the diameter of the coin is comparable in magnitude to the height from which it is tossed, then it will affect the outcome. This could be relevant for oversized dummy coins - a quarter meter or so in width.
If all side lengths are changed so the new shape is proportionately equal, the angles don't change. But if it's not proportion. equal, then the angles will be different
Well its lw=a so quadrupling it would make it (L4)W=A or lw4