Szczegółowe wyjaśnienie:
Dla cala:
[tex]1 \: cal = 2.54 \: cm \\ {(1 \: cal)}^{2} = {(2.54)}^{2} \\ {1}^{2} {cal}^{2} = {2.54}^{2} \\ 1 \: {cal}^{2} = 6.4516 \\ 2 \: {cale}^{2} = 2 \times 6.4516 \\ 2 \: {cale}^{2} = 12.9032[/tex]
Dla stopy:
[tex]1 \: stopa = 12 \: cali = 12 \times 2.54 = 30.48 \: cm \\ {(1stopa)}^{2} = {(30.48)}^{2} \\ 1 \: {stopa}^{2} = 929.0304 \\ 2 {stopy}^{2} = 2 \times 929.0304 \\ 2 \: {stopy}^{2} = 1858.0608[/tex]
