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314 = 1/3.3,14.5^2.t
314/3,14 = 1/3.25.t
100 = 25/3.t
100/25/3 = t
100.3/25 = t
12 = t
S^2 = 12^2+5^2
S^2 = 144+25
S^2 = 169
S = akar kuadrat(169) = 13cm