10cm is a length. You can only find perimeter (length all the way round) if there is a shape!
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what is the perimeter of a 11cm x 10cm rectangle answer 42
30cm
10cm by 10cm (perimeter=40cm), 5cm by 20cm (perimeter=50cm), 50cm by 2cm (perimeter=104cm), 100cm by 1cm (perimeter=202cm). All of these rectangles' areas are 100cm2
Perimeter = 6*10 = 60 cm
Divide the perimeter by 4 to get the length of a side. Then you can square that to get the area.