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Answer:
(pi)(n^2 - n^2)
Explanation:
A = (pi)r^2
r = n
A_n = (pi)n^2
r = m
A_m = (pi)m^2
A_sombreada = A_n - A_m =
= (pi)n^2 - (pi)m^2
= (pi)(n^2 - n^2)
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