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P=2.r.pi
Aplicas propiedad conmutativa (el orden de los factores no afectan el producto.)
P=2.pi.r
Despejando r
r=(p)/2.pi
a=30m
r=30/2.3,14
r=4,8
b=60
r=60/2.3,14
r=9,55
C=120
r=120/2.3,14
r=19,1
D=240
r=240/2.3,14
r=38,2