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3π=2πr/π
3=2r
r=3/2
P=2πr²
P=2*3,14*(3/2)²
P=6,28*9/4=56,52/4=14,13
f)
3/4π=2πr
3/4=2r
r=3/4*1/2=3/8
P=2*3,14*(3/8)²=6,28*9/64=56,52/64=0,88