Jawabanmu

2014-05-05T19:45:43+07:00
Un = a.r n-1 => U4 = a.r pangkat n-1 => 54 = 16 . r pangkat 3 => 54/16 = r pangkat 3 => 27/8 = r pangkat 3 => r = 3/2 Cari U2 => U2 = 16 x 3/2 = 24 U3 => 24 x 3/2 => 36 Total tali : 16 + 24 + 36 + 54 => 130 cm
terimakasih sangat membantu :D
Sama sama :)