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K = 2πr
260,2 = 2(3,14)r
260,2 = 6,28r
r = 260,2 : 6,28
= 41,43 cm
L = πr²
= 3,14 X (41,43)²
= 3,14 X 1716,44
= 5389,62 cm²
Semoga membantu.
Maaf kalau salah.
520400 : 2000 =
hasilnya di kali sama 3,14
heheh maaf ya kalo salah