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2000 x 6,28 r = 5204
r = 0,414
Lp= π r² = 3,14 x 0,414² = 0,538 m
K = 5204000 : 2000 = 2602
K = 2 πr
2602 = 2 x 3.14 x r
2602 = 6.28 r
r = 2602 : 6.28
r = 414,3 cm
L = πr²
L = 3.14 x 414,3 x 414.3
L = 538963.6986cm² atau 538964
Yg jari-jarinya kalau mw di ganti 414,3 dengan 414 bisa kok caranya sama.