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r=2:d
=10,5:2
= 5,25
k. lingkaran = 2Πr
= 2*3,14*5,25
= 32,97
2) d= 58
r=d:2
=58:2
= 29
k. ling= 2Πr
= 2*3,14*29
=6,28*29
= 182,12