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P = 2 π r despejamos r
r = P / 2π sustituimos datos
r = 42 / 2 ( 3.1416 )
r = 42 / 6.2832
r = 6.68 cm
b ) El área se calcula con
A = π r² despejamos r
r = √ A / π
r = √ 69.4 / 3.1416
r = √ 22.09
r = 4.7 pulgadas