$$6250\ mm=$$
$12500m$
$$\frac{\mathrm{d}}{\mathrm{d}m}(6250m^{2})$$
$$2\times 6250m^{2-1}$$
$$12500m^{2-1}$$
$$12500m^{1}$$
$$12500m$$
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$6250m^{2}$
$$6250m^{2}$$