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*Luas =22/7×r×r atau 3,14×r×r
3.D=20 L=314
4.D=30 L=706,5
5.D=24 L=452,16
6.r=17,5 L=962,5
7.r=14 L=616
8.r=15 L=706,5
9.r=17 L=907,46
10.r=20 L=1256