diketahui lingkaran dengan luas 2.122.64 cm². keliling lingkaran tersebut adalah
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L = πr²
2.122,64 = 3,14r²
3,14r² = 2.122,64
r = √2.122,64/3,14
r = √676
r = √26²
r = 26 cm
maka :
K = 2πr
= 2(3,14(26)
= 6,28(26)
= 163,28 cm