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volume tabung = 1.540 cm³
jari jari (r) = 7 cm
tanya: L. kaleng tanpa tutup?
jawab:
pertama" cari dulu tinggi tabung
v. tabung = π.r².t
1540 cm³ = 22/7 x 7 cm x 7 cm x t
1540 = 154 x t
t = 1540/154
t = 10 cm
luas kaleng tanpa tutup
= luas alas + luas selimut
= π.r² + 2.π.r.t
=( 22/7 x 7 x 7) +( 2 x 22/7 x 7 x 10)
= 154 + 440
= 594 cm²
jadi luas kaleng adalah 594 cm²
"maaf kalau salah"