Find the circumference of the circled with the following radius: \[\left( Take\,\pi \,=\frac{22}{7} \right)\] |
(a) 14 cm |
(b) 28 mm |
(c) 21 cm |
Answer:
We know that the circumference C of a circle of radius r is given by C =\[2\pi r\]. (a) Here, r = 14 cm \[\therefore \] C = Circumference =\[2\pi r\] \[=\left( 2\times \frac{22}{7}\times 14 \right)cm\] = 88 cm (b) Here, r = 28 mm \[\therefore \] C = Circumference = \[2\pi r\] \[=2\times \frac{22}{7}\times 21\,\,cm\] \[=2\times 22\times 3\,\,cm\] = 132 cm (c) Radius = 21 cm Circumference = \[2\pi r\] \[=23\times \frac{22}{7}\times 21\,\,cm\] = 2 × 22 × 3 cm = 132 cm
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