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550 = 22/7 x d x 12,5
550 x 7 = 22 x 12,5 x r
3.850 = 275r
r = 3.850 / 275 = 14 cm
550 cm = 2 × × r × 12,5
3850 cm = 550 cm × r
r =
r = 7 cm