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= πr² + 2πrt
= πr(r+2t)
= 3,14.18(18+2.20)
= 56,52(18+40)
= 56,52.58
= 3278,16 cm²
luas selimut= 3.14x36x20=2260.8
Lp=1017.36+2260.8=3278.16