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Matematika SD Kelas VI
tabung
luas selimut = 2 x π x r x t = 220
2 x 22/7 x r x 7 = 220
r = 220/44
r = 5 cm
luas sisi = 2 x π x r x (r + t)
= 2 x 3,14 x 5 x (5 + 7)
= 31,4 x 12
= 376,8 cm²