Perimeter of a circle is 2 x π x r, directly proportional to radius r. Therefore, the ratio of circumferences C1 / C2 = (2πr1) / (2πr2) = r1 / r2 = 5 / 4, so ratio of radii is ...
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Using C = 2 x π x r with π = 22/7 gives: (i) 2 x (22/7) x 7 = 44.0 cm, (ii) 2 x (22/7) x 10 = 62.9 cm, and (iii) 2 x (22/7) x 12 = 75.4 ...