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phi.r² = 818
22/7.r² = 818
22.r² = 818.7
22.r² = 5726
r² = 5726:22
r² = 260,3
r = 16,1 cm
818 = 22/7 .r²
818.7/22 = r²
260,27 = r²
√260,2 = r
16,1 = r
jadi jari jari 16,1 cm