Answer:
4444 mm²
Explanation:
Pressure, P, is given by
[tex]P = \dfrac{F}{A}[/tex]
where F is the force and A is the area.
[tex]A = \dfrac{F}{P}[/tex]
Using the values in the question,
[tex]A = \dfrac{20}{4500} = 0.00444\ldots\,\text{ m}^2[/tex]
To convert to mm², note that 1 m = 1000 mm.
So 1 m² = 1000 × 1000 mm²
[tex]\therefore A = 0.004444\times 1000000 \text{ m^2}[/tex]
[tex]A = 4444 \text{ m^2}[/tex]
