Answer:
I think it is <em><u>Rooting</u></em><em> </em><u><em>Reflex</em></u>
A = 4\pi r^2
A = 4\pi (2\mu m /2)^2 (10^{-6}m/1\mu m)^2 (1mm/10{-3})^2
A = 1.33*!0^{-5}MM^2
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