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2nr = Kliling
r = 251,2 / 2n = 251,2 /(3,14 x2) = 40cm
Luas = πr² = 3,14 x 40² = 5.024 cm³
jarak = banyak putaran x keliliing lingkaran
502400 = 2000 x 2 x 3,14 x r
502400 = 12560r
r = 502400/12560 = 40 cm
luas = πr² = 3,14 x 40² = 5024 cm²