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314 = 1/3 × 3,14 × 5 ×5 × t
942 = 3,14 × 25 × t
942 = 78,5 t
t = 12cm
s^2 = t^2 + r^2
s^2 = 12^2 + 5^2
s^2 = 144 + 25
s^2 = 169
s = akar 169
s = 13 cm