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1848 = 2.22/7.r.35
1848 = 220.r
r = 8,4 cm
luas tabung tnp tutup = phi.r^2 + luas selimut = 22/7.8,4^2 + 1848 = 221,76 + 1848 = 2069,76 cm^2
=luas selimut 1.848cm²
dit=cm²
jb=1848÷35
=52.8 cm²