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550 = 22/7 * d * 25
d = 550/25 * 7/22
d = 22*7/22
d = 7
550 = 2 · 3,14· r · 25
550 = 15,7 · r
r = 550 ÷ 15,7
r = 35,03
d = 2r
d = 2(35,03)
d = 70, 06 cm