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438.815 = 3.14 x 6.5 (6.5 + s)
438.815 = 20.41 (6.5 + s)
438.815/20.41 = 6.5 + s
21.5 = 6.5 + s
s = 21.5 - 6.5 = 15 cm
Luas Selimut = πrs = 3.14 x 6.5 x 15
= 306.15 cm²