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Yes, this is fairly easy and a simple test in many exams where deriving a measurement from another measurement is asked for, but where the two are not directly related by a formula.

Knowing that the formula for a circle's area is pi x r2, we can substitute r for d/2, as that is the definition (diameter is double radius, radius is half diameter). Thus, A = pi x (d/2)2 = pi x (d2)/4.

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