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b. 5 : 10 = 1 : 2
(3,14 x 5 x 5) : (3,14 x 10 x 10)
78,5 : 314 => 1 : 4
2.) K : roda 1 : roda 2
(2 x 3,14 x 5) : (2 x 3,14 x 10)
31,4 : 62,8 => 1 :2
^^