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1256 = 3.14 × R^2
r^2 =400
r = 20
d = lebar = 2 × 20
= 40
Luas selimut tabng = t × d = 40 × 40
= 1600 cm^2
phi×r2=1256
3,14×r2=1256
r2=1256:3,14
r2=400
r=20
lst=2×phi×r×t
2×3,14×20×40
=5024