Jawabanmu

2014-06-16T19:48:44+07:00
D= √R²-(Ra+Rb)²
d= √17²-(5+3)²
d=√289-64
d=√225
d= 15
2014-06-16T19:49:16+07:00
P = 17
R =5
r= 3

d ^{2} =  p^{2} - (R+r) ^{2}
=17^ - (5+3)^ = 17^ - 8^ = 225 =  \sqrt{225} = 15