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880=22/7*r^2
r^2=880*7/22
r^2 = 280
r = akar 280 = 2akar70
r² = L/phi
= 880 / (22/7)
= 880 x 7 / 22
= 6160 /22
= 280
r = √280
= √(70.4)
= 2 √70 cm