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-d=36
-p=39
-r1=6
jawab
d^2=p^2-(r1+r2)^2
36^2=39^2-(6+r2)^2
1296=1521-(6+r2)^2
(6+r2)^2=1521-1296
(6+r2)^2=225
6+r2=√225
=15
r2=15-6
r2=9
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