Step-by-step explanation:
[tex] 2500 \: {mm}^{2} \\ \\
=2500\: 1\: mm\times 1\: mm\\
=2500\times\frac{1} {1000}\:m \times \frac{1} {1000}\:m\\
=2500\times\frac{1} {1000\times 1000}\:m^2 \\
=2500\times\frac{1} {1000000}\:m^2 \\
=2500\times\frac{1} {10^6}\:m^2\\
= 2500 \: \times 10^{-6}\: m^2 \\
= 0.0025 \: {m}^{2} \\ \\ \bigg( \because1 \: mm = \frac{1}{1000} \: m \bigg)[/tex]
