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438,815 = 3,14 x 6,5(6,5+ s)
438,815 = 20,41( 6,5 +s)
438,815 = 132,665 + 20,41 s
20,41 s = 306,15
s = 15
L. selimut = πrs
= 3,14 x 6,5 x 15
= 306,15 dm²