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L=2πrt
528 = 2x 3,14 x r x 12
528 = 75,36r
r = 528 = 7
75,36
jadi r =7
Ls = 582 cm²
t = 12cm
r = ....?
Ls = 2πrt
582 = 2×3,14×r×12
582 ÷ (2×3,14×12) = r
582 ÷ 75,36 = r
7cm =r