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706,5=22/7×r²
706,5=3,1×r²
r²=706,5/3,1
r=√227,9=15
d=r×2=15×2=30cm
b. l. lingkaran=Πr²
3850=22/7×r²
3850=3,1×r²
r²=3850/3,1
r=√1241,9=35,2
d=r×2=35,2×2=70,4cm