Jawabanmu

2014-04-13T13:41:56+07:00
/d*2 - (R-r)*2 /13*2 -(7-2)*2 /13*2-5*2 /169-25 /144 = 12 cm jawaban trbaik oke
Wow, caranya lenih singkat :D
*lebih
jawaban terbaik oke
2014-04-13T13:44:18+07:00
GS =  \sqrt{Jarak Pusat^{2}  - (R - r)^2}
GS =  \sqrt{13^2 - (7-2)^2}
GS =  \sqrt{169 - 5^2}
GS =  \sqrt{169 - 25}
GS =  \sqrt{144}
GS = 12