Jawabanmu

2014-06-09T15:52:56+07:00
(R-r)=(akar jp^ - gspl^)
(15-r)=(akar 26^-24^)
(15-r)=(akar 676-576)
(15-r)=(akar 100)
(15-r)=10
r=15-10
= 5 cm