Jawabanmu

2014-06-04T11:05:09+07:00
K = 2 . 22/7 . r
396 = 44/7 . r
r = 63
2014-06-04T11:46:26+07:00
R=K / 22/7 x 2
=396 x 7/22 / 2
=63 cm.