: 1 (2, 3, 4) (5, 6, 7, 8) : 109.5 (118.4, 126, 135.6)(143.3, 151, 160.5, 169.4)
30.5 . 28 .
25 28 = 10 1x1 4.5 . 18 28 = 10 4.5 .
: