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188,4=2×3,14×r×10
188,4=62,8×r
188,4/62,8=r
3=r
2. L.permukaan=2Πr(r+t)
471=2×3,14×5(5+t)
471=31,4(5+t)
471/31,4=(5+t)
15-5=t
10=t