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2014-04-03T19:16:51+07:00
706.5 cm.......................................................
1 5 1
2014-04-03T19:22:44+07:00
K = π . d
94,2 = 3,14 . d
d = 94,2 : 3,14
d = 30
r = 30 : 2
r = 15

L = πr²
L = 3,14 . 15 .15
L = 706,5 cm²