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Q.

The circumference of the circle which radius 4 cm is

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a

8π cm

b

16π cm

c

19π cm

d

4π cm 

answer is A.

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Detailed Solution

It is given to find the circumference of the circle with radius 4 cm.
The circumference of the circle with radius r unit is 2πr unit.
Here r = 4cm.
So circumference of the circle will be,
2π(4)
⇒8π
So the circumference of the circle is  8π cm.
So the correct option is 1.
 
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The circumference of the circle which radius 4 cm is