Answer:
(a) 14 cm \[\text{r =14 cm}\] \[\therefore \] Circumference of the circle \[\text{= 2 }\!\!\pi\!\!\text{ r = 2 }\!\!\times\!\!\text{ }\frac{\text{22}}{\text{7}}\text{ }\!\!\times\!\!\text{ 14 = 88 cm}\] (b) 28 mm \[\text{r = 28 mm}\] \[\therefore \] Circumference of the circle \[=2\pi r=2\times \frac{22}{7}\times 28=176\text{mm}\] (c) 12 cm \[\text{r = 21 cm}\] \[\therefore \] Circumference of the circle \[\text{= 2 }\!\!\pi\!\!\text{ r = 2 }\!\!\times\!\!\text{ }\frac{\text{22}}{\text{7}}\text{ }\!\!\times\!\!\text{ 21 = 132 cm}\].
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