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30cm
16cm.
Perimeter of rectangle: 5+3+5+3 = 16cm
perimeter = 8+8+5+5 = 26cm
The perimeter of a rectangle cannot be determined with the area alone as the lengths could vary. For example, the perimeter of the rectangle could be 12 (1 and 5) or 9 (2 and 2.5). For both cases, the area is still 5cm2, but the length can still change to result in different results.