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r² = 2464 : 22/7
r² = 2464 x 7/22
r² = 112 x 7
r² = 784
r = 28
jari-jari = 28
B.) diameter = 28 x 2 = 56
C.) K = πd
= 22/7 x 56
= 22 x 8
= 176
Keliling = 176
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