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tabung
jari jari(r) = 7 cm
tinggi(t) = 18 cm
ditanya: luas permukaan tabung(L)?
jawab:
luas permukaan tabung
= 2πr(r+t)
= 2 x 22/7 x 7cm (7 cm+ 18 cm)
= 44 cm x 25 cm
= 1.100 cm²
jadi luas permukaan tabung tsb adalah 1100 cm²