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Q.

Find the circumference of a circle whose diameter is 7 cm.


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a

20 cm

b

22 cm

c

25 cm

d

29 cm 

answer is B.

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Detailed Solution

Given a circle having diameter 7 cm.
The circumference of the circle formula is,
C=πd  
Substituting given diameter in circumference formula.
⇒C= 22 7 ×d  
⇒C= 22 7 ×7  
⇒C=22cm  
Therefore, the circumference of the circle is 22 cm.
Hence, option 2 is correct.
 
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