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154=22/7 x r^2
r^2=7/22 x 154
r^2=49
r=akar 49
r=7
2.1256=3,14 x r^2
r^2= 1256/3.14
r^2=400
r=akar 400
r=20
3.2826=3.14 x r^2
r^2=2826/3.24
r^2=900
r=akar 900
r=30
4.3850=22/7 x r^2
r^2=3850 x 7/22
r^2=1225
r=akar 1225
r=35
klo da yang tdakl jelas tanyaka?