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5r = 3t
t = (5/3)r
Luas selimut tanpa tutup = 2πrt + πr²
156π = 2πrt + πr²
156 = 2 x r x (5/3)r + r²
156 = (10/3)r² + r²
(13/3)r² = 156
r² = 36
r = 6