Jawabanmu

Jawaban paling cerdas!
2014-04-18T18:54:17+07:00
D =  \sqrt{s^2 - (R+r)^2}
 \sqrt{29^2 - (10+11)^2}
 \sqrt{841 - (21^2)}
 \sqrt{841-441}
 \sqrt{400}
= 20 cm

semoga membantu :)

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