Jawabanmu

2014-02-16T20:27:43+07:00
Pd²=d²-(R+r)²
24²=26²-(6+r)²
576=676-(6+r)²
(6+r)²=676-576
(6+r)²=100
(6+r)=√100
6+r = 10
  r = 10-6
  r = 4
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