It depends on the shape - triangle, parallelogram etc.
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The perimeter is 120 cm
60cm
If all you need is the area of the base, the heigth is irrelevent. Length x Width = Area. Multiply 3.2 x 4.0 = 12.8 squared cm. The nearest squared cm is 13.
Yes an area problem must have an squared unit. Suppose: Find the area of a suare with side 8 cm. Thus, 8 squared will be 64cm. Your answer will be 64 squared cm.
base x height = area 2 cm x 2cm = 2cm^2 (squared) :)