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LPP = πr (r+s) = 438,815
3.14. 6,5 (6,5 + s) = 438,815
(20,41 )(6,5 + s) = 438,815
(6,5+ s)= 438,815 : 20,41 = 21,5
s = 21,5 - 6,5 = 15
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luas selimut = π r s = 3,14 x 6,5 x 15= 306,15 cm²