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l lingkaran = phi x r kuadrat.
1256 = 3.14 x r kuadrat
4 = r kuadrat
2 = r
jd jari2 2 cm.
d= 4 cm
luas selimut = keliling lingkrn x tnggi tabung.
l. selimut = phi x d x t
= 3.14 x 4 x 40
= 502,4 cm persegi