If it is a square, divide 12 mm by 4. Obviously it is a 3 mm per side. You don't have enough info for a rectangle or other shape unless it is a triangle which would be 4 mm for an equilateral triangle.
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Area = side x side; perimeter = side x 4.
Perimeter = 4*Side so that Side = Perimeter/4 Area of a rhombus = Side * Altitude so Altitude = Area/Side = Area/(Perimeter/4) = 4*Area/Perimeter
The same way you find the perimeter of a rectangle, add the side lengths
Find out what 1 side is and multiply by 3 to find perimeter
Not exactly. If I know the side lengths, I can still find the perimeter