Jawabanmu

2014-03-26T08:32:31+07:00
Panjang tali =  \frac{1}{2}K_{linkaran1} +   \frac{1}{2}K_{linkaran2} + 2( r_{lingkaran1 + r_{lingkaran2} } )
144 =  \pir +  \pi r + 2 (2r)
144 = 2 \pi r + 4r
72 = r( \pi + 2)
72  = r  ( \frac{22}{7} + 2)  = r ( \frac{36}{7} )

r =  \frac{72x7}{36} = 14 cm