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88704 = 3,14 × r2 x 36
88704 = 113,04 × r2
r2 = 88704 ÷ 113,04
r = akar 784,7
r = 28
L = 2 x phi x r x t
= 2 × 22/7 × 28 × 36
= 6336cm2
maaf kalau salah