Sebuah tabun tanpa tutup volumenya 18840 cm3 jika jari-jari tabung 20cm, temtukan luas permukaannya
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v= 18.840cm³
r = 20cm
lp = ....?
v = πr²t
18.840 = 3,14×20×20×t
18.840 = 1256 × t
18.840 ÷ 1256 = t
15cm = t
lp = πr²+πdt
lp= 3,14×20×20+3,14×40×15
lp= 1256 + 1884
lp= 3140cm²
maaf kalo salah