Find the circumference of the circles, given that:
(a) radius= 21 mm
(b) diameter= 14 cm

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Solution

Dear Student,

${The circumference of a circle = 2πr}^{} (r = r a d i u s o f t h e c i r c l e) (a) R a d i u s = 21 m m C i r c u m f e r e n c e = 2 π 21^{} = 2 \times \frac{22}{7} \times 21 = 132 m m = 13.2 c m (b) D i a m e t e r = 14 c m R a d i u s = \frac{14}{2} = 7 c m C i r c u m f e r e n c e = 2 \times \frac{22}{7} \times 7 = 44 c m R e g a r d s,$

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Similar questions

Find the circumference of the circles with the following radius: (Takeπ)

(a) 14 cm (b) 28 mm (c) 21 cm

(Take π = \frac{22}{7})

14 c m

28 c m

21 c m

(T a k e π = \frac{22}{7})

= 14 m m

= 49 m

= 5 c m

Find the area of the following circles, given that:

(a) radius = 14 mm (Takeπ) (b) diameter = 49 m

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