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A = π r² ∅ / 360 ∅ --- es el ángulo del sector
despejamos r
r = √ 360 A / π ∅ sustituyendo
r = √ 360 ( 3/4 π ) / 30 π se elimina π al dividirse
r = √ 270 / 30 = √ 9 = 3 360(3/4) = 270
r = 3