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a =πr² π= 3,1416 r = radio
28,26 = 3,1416r²
28,26/3,1416 = r²
8,99 =r²
√8,99 = r
r = 2,999
r aproximando = 3 decimetros
longitud = 2πr
L = 2*3,1416 *3
L =18,84 dm