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Q.

Is it true that a circle of radius 9cm has a circumference of 57.2cm?


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a

True

b

False 

answer is B.

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Detailed Solution

We know that circumference of a circle is 2πr , where r is the radius of the circle.
So,
Circumference= 2πr
57.2=2× 22 7 ×r
r= 57.2×7 2×22
r=9.1cm
Hence, the given statement is false and option 2 is correct.
Therefore, the radius of the circle with a circumference of 57.2cm is 9.1cm.
 
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Is it true that a circle of radius 9cm has a circumference of 57.2cm?