Question

Jika luas tabung tanpa tutup 3.454 cm² dan jari-jari10 cm, maka volume tabung adalah.....

Answer 1

Luas = πr² + 2πrt
3454 = πr(r + 2t)
3454 = 31,4 (10 + 2t)
110 = 10 + 2t
t = 100/2
  = 50
v. = πr² t
   = 3,14 x 10 x 10 x 50
   = 15.700

Answer 2

Lp tnpa tutup=π×r(2.t+r)
3,454=3,14×10(2.t+10)
3.454=31,4(2t+10)
3.454=62,8t+314
3.454-314=62,8t
3140=62,8
t=3140/62,8
t=50cm
V=π×R²×t
  =3,14×10×10×50
  =15700cm³