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P=πr²
P=π(26/5)²
P=26/5 π
O=2πr
O=2π26/5
O=26/10 π
P=πr²
P=π*(¹⁶/₃cm)²=π*256/9cm²=28,(4)πcm²
Ob=2πr
Ob=2π*¹⁶/₃cm=³²/₉πcm=3⁵/₉πcm
P = 3,14 × (5 ⅓)²
P = 89,32
L = 2πr
L = 2 x 3,14 x 5 ⅓
L = 33,49