50
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P = 20cm
112 cm squared
If by length you mean diameter then the surface area is 80π cm squared= about 251.327cm squared
id say 10.000
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