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Q.

If the radius of a circle is 7π, what is the area of the circle (in cm2)?

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a

154

b

49π

c

22

d

49  

answer is D.

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Detailed Solution

Given the radius of circle r=7π.
Now the area of the circle =π(r)2. ⇒π×(7π)2 ⇒π×49π ⇒49cm2 Hence, the area of the circle is 49 sq. cm.
Hence, option 4 is correct.
 
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