Jawabanmu

2014-05-30T15:19:43+07:00
Dik = So = 30,  ho = 2cm,  R = 30

f = 1/2 . R
f= 1/2 . 30
f= 15

s' = So . f / So -f
s' = 30 . 15 / 30 - 15
s' = 450 / 15
s' = 30

ditanya = h'?

h' = s' . ho / So
h' = 30 . 2 / 30
h' = 60 / 30
h' = 2