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A= π*9^2*120/360
A=π*81*120/360
A=30536,28/360
A=84,8cm^3
Donde:
Radio está en cm
ángulo en radianes
El ángulo es 120° o 120.(π/180) = 12π/18 = 2π/3.
Reemplazando:
Área = (9)(2π/3)/2
Área = (18π/3)/2
Área = (6π)/2
Área = (3π). Respuesta.