Jawabanmu

2014-01-26T19:55:49+07:00
A. L = vhi x r^2
    314 = 3,14 x r^2
    r^2 = 314 : 3,14 = 100
    r = akar 100 = 10 cm
b.1386 = 22 x r^2
                7
   r^2 = 1386 : 22 = 441
                        7
  r = akar 441 = 21 cm
c.2826 = 3,14 x r^2
   r^2 = 2826 : 3,14 = 900
   r = akar 900 = 30 cm
d.2464 = 22 x r^2
               7
   r^2 = 2464 : 22 = 784
                        7
   r = akar 784 = 28 cm
2014-01-26T20:01:34+07:00