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12,56 x r² = 113,04
r² = 113,04 : 12,56
r² = 9
r = √9
r = 3
d = 2r
d = 2(3)
d= 6
2. 22/7 x 7² x t = 836
154 x t = 836
t = 836 : 154
t = 5,428.....
t = 5,43 (dibulatkan)