Question

Need help with FOV area (mm2) totally confused?
im confused i have the FOV diameter they are:
4x = 5
10x = 2
40x = 0.5

a classmate told me she thinks the area for 40 x is:
pi(5/2)^2 = 19.6
not sure if that's true or how to do it for the low and medium, magnification.
please help its due in a few days!

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