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1/3πr²t = 2411,52
3,14.12.12.t = 7234,56
452,16 t = 7234,56
t = 16 cm
s² = r² + t² = 12² + 16² = 144 +256 = √400 = 20 cm
L.selimut kerucut = πr(r+s) = 3,14.12(12+20) = 3,14.12.32 = 1205,76 cm²
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