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Q.

Circumference of a circle with radius r is

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a

2πr

b

4πr  

c

3πr

d

πr

answer is B.

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Detailed Solution

It is given to find the formula of circumference of a circle with radius r .
Circumference of a circle whose radius is r is given by 2πr, where r is the radius of the circle and π≈3.14.
Hence, required solution is 2πr.
Hence, option 2 is correct.
 
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