Question 19

Circumference of a circle of diameter 5 cm is

(a) 3.14 cm
(b) 31. 4 cm
(c) 15.7 cm
(d) 1.57 cm

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Solution

Given, diameter of a circle = 5 cm
$∴ R a d i u s = \frac{5}{2} c m$ $[∵ r a d i u s = \frac{d i a m e t e r}{2}]$
Now, circumference $= 2 π r = 2 \times \frac{22}{7} \times \frac{5}{2} = \frac{110}{7} = 15.7 c m$

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