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2.- the area of the circle it's 254,34cm²
area = (10cm)² * π
area = 100cm² * 3,14
area = 314 cm²
radium = 18cm : 2
radium= 9cm
area = (9cm)² * 3,14
area = 81cm² * 3,14
area = 254,34 cm²
saludos