12
Infinitely many all different:
As it is only the area that matters, the perimeter can be any shape:
And there are also the non-regular shapes, eg an L shaped hexagon, a kite, a parallelogram which can have an area of 5 square units.
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10, 10 and 1
Infinitely many. You can have a circle with a radius of approx 1.78 units. Or, for any positive value of x, an ellipse whose axes are x units and pi/(10*x) units in length, a triangle whose base is x units and whose vertical height is 20/x units, a parallelogram whose base is x units and whose vertical height is 10/x units. And then there are polygons of 5, 6, sides and so on. You can also combine a triangle with an area of 4 units with a semicircle with an area of 6 units and other weird and wonderful shapes.
Yes, you can. If you make it 1 unit by 5 units
It doesn't make sense to convert that. You can only convert units of the same kind, e.g., units of length to units of length; units of area to units of area; units of time to units of time, etc.
It depends on the 7 shapes that you start with.