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L.alas=1256cm persegi
V.tab= L.alas × t
18840= 1256 × t
t= 18840:1256
= 15cm
L.alas= phi × r ×r
1256=3,14×r×r
r×r=1256 : 3,14=400
L.slimut tab= phi × r × 2 × t
= 3,14 ×20×2×15
=3,14 × 600
= 1884cm persegi
L.permukaan tab= L.alas × 2 + L.slimut tabung
= (1256 × 2) +1884
= 2512+1884
= 4396 cm persegi