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Q.

If the area of a circle is 50.24  m 2  , find its circumference.


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a

28.12 m

b

25.12 m

c

24.12 m

d

22.12 m 

answer is B.

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Detailed Solution

Given the area of a circle is 50.24  m 2  .
Area of a circle formula is,
A=π r 2  
⇒50.24= 22 7 ×r×r  
⇒r= 50.24×7 22  
⇒r= 15.985  
⇒r=3.998m  
Assume, circumference = C and its formula is,
C=2πr ⇒C=2× 22 7 ×3.998  
⇒C=25.12m  
Therefore, circumference is 25.12 m.
Hence, option 2 is correct.
 
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