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88704 = 22/7 x r^2 x 36
88704 = 792/7 x r^2
r^2 = 88704 x 7/792
r^2 = 784
r =√784
r= 28
Luas selimut = 22/7 x 2r x t = 22/7 x 2 x 28 x 36 = 6336