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Q.

What is the circumference of a circle of diameter 5 cm?


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a

31.4 cm

b

15.7 cm

c

1.57 cm

d

3.14 cm 

answer is A.

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Detailed Solution

Given data,
Diameter of circle = 5cm.
Circumference of circle is,
2πr  , r stands for the radius.
Substituting the values,
C=2π×5 =2×3.14×5 =31.4cm  
Therefore, the circumference of a circle of diameter 5 cm is 31.4 cm.
Hence, option 1 is correct.
 
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What is the circumference of a circle of diameter 5 cm?