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r= l/2π
r= 12,56/6,28
r=2 cm
P= πr²
P= 3,14× 4= 12,56
r=l/2π
P=πr²
P=π*(l/2π)²
P=l²/4π
P=39,4384/π [cm²]
dla π=3,14 mamy:
P=12,56 [cm²]