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2r×π=12π/÷π
2r=12/÷2
r=6
P koła =π×r²
P koła=π×6²
P koła=36π
r = 6cm
P=πr²
P=π*(6cm)²
P=36πcm²
r = 6 (cm)
P = πr² = π*6² = 36π (cm²)