volume tabung : 2156 tinggi : 14 ditanyaluas permukaan tangki ????

2156 = 22/7 . r.r.14
686 = r.r .14
49 =r.r
9 = r

lp = 2 .3,14 .9 (9+14)
lp = 56,52(23)
lp = 1299,96

volume = n r² t
2156 = 22/7 x r² x 14
r²= 2156 :44
r²= 49........r = 7
Luas Permukaan = 2 n r (r + t)
     = 2 x 22/7 x 7 (7 + 14)
    =44 x (21)
    = 924