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Q.

If the radius of a circle be 5 cm, then its area will be equal to

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a

10π cm2

b

25π cm2

c

20π cm2

d

None of these 

answer is B.

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Detailed Solution

Let r be the radius of circle
We know that, area=πr2cm2.
Therefore, the area of the circle is
 πr2
π(5)2
25π
So area of the circle is 25π cm2.
Hence, option 2 is correct,
 
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