Answers

2016-03-27T16:51:30+05:30
Given that
volume (v)=78848cm³
diameter=56cm
so radius (r)= 28cm
now
volume of a cone=πr²h
=>78848=22/7*28*28*h
=>h=32
now
TSA=πr(r+l)
=22/7*28(28+√32²+28²
=3741.811cm²
0
plzzzzz mark it as brainlist
its wrong volume of cone
yes sorry
by mistake
yaaaa.....
2016-03-27T17:03:45+05:30
Volume of cone = 78848cm³
radius = 28cm
Now,  1/3Πr²h = 78848
         1/3 x 22/7 x 28 x 28 x h = 78848
           22 x 4 x 28 x h = 78848 x 3
           2464 x h = 236544
             h = 96cm
Now,  T.S.A of Cone = Πrl + Πr²
 since, l = sant height
   ∴  height² + radius² = l²
        96² + 28² = l²
        9216 + 784 = l²
         10000 = l²
∴     l = 100cm
 Now, TSA = 22/7 x 28 x 100 + 22/7 x 28 x 28
                  =  800+2464
                  = 3264cm²
TSA of Cone = 3264cm² 
0