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 cm.
Calculate, correct to 3 significant figures, the circumference of a circle with: (i) radius 7 cm (ii) radius 10 cm (iii) radius 12 cm.
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