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31400 = 3, 14 × D
31400/ 3, 14 = r"
10.000 = r"
r = 100 Jadi diameternya = 2×100 = 200cm Keterangan " = kuadrat
31400 = 1/4 x 3,14 × D^2
10000 × 4 = D^2
D = 200 cm