P=2πr4+2r=2π∗84+2∗8=16+4π≈28.57cm.P=\frac{2\pi r}{4}+2r=\frac{2\pi *8}{4}+2*8=16+4\pi\approx28.57 cm.P=42πr+2r=42π∗8+2∗8=16+4π≈28.57cm.
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