Lp=2Πr²+2Πrt
.=2Πr(r+t)
Lp=2×22/7×7²+2×22/7×7×21
=1.232
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Lp=2Πr²+2Πrt
.=2Πr(r+t)
Lp=2×22/7×7²+2×22/7×7×21
=1.232