Jawabanmu

2014-06-03T13:47:17+07:00
Jaraknya = √( 15 x 15 ) + ( 6 + 2 )( 6 + 2 ) = √ 225 + 64 = √289 = 17
2014-06-03T13:48:32+07:00
P² = d² + (r1 + r2)² = 15² + (6 + 2)² = 225 + 64 = 289
p = √289 = 17 cm
jawaban: 17 cm