If you mean how many mm in 20cm then there are 200mm
1 ft = 30.48cm 20cm = 20/30.48 inches or 0.656in
12cm*20cm = 240 cm2 = 37.2 sq inches = 0.258 sq ft
5 times 20cm = 1 meter
20cm is approximately 8 inches or 2/3 of a foot
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