Jawabanmu

2014-05-15T19:35:46+07:00
24= s.s-324
s.s=24.24+324
s.s=900
s= 30
2014-05-15T19:37:38+07:00
 d^{2} =  p^{2} - (R+r)^{2}
p^{2} = d^{2} + (R+r)^{2}
   p   =  \sqrt{24^{2} + 18^{2} }
      =  \sqrt{576 + 324}  \sqrt{900} = 30 cm