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1 stopa = 12 cali
1cal² = 2,54*2,54cm²=6,4516cm²
1 stopa = 12*2,54 cm
1 stopa=30,48cm
1 stopa² = 30,48*30,48cm²=929,0304cm²
stopa kwadratowa=stopa*stopa=12*cali*12 cali=12*2,54cm*12*2,54cm=929,0304cm²