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Q.

Find the area of the circle whose diameter is 42 cm.


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a

1000c m 2

b

1113c m 2

c

1256c m 2

d

1386c m 2  

answer is D.

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Detailed Solution

Given that, the diameter of the circle is 42 cm.
The radius of the circle is given by,
Radius= Diameter 2 = 42 2 =21cm
The area of the circle is given by the formula,
A=π r 2 where r is the radius of the circle.
So, the area of the circle is given by,
Question ImageSo, the area of the circle is 1386c m 2 .
Hence, option 4 is correct.
 
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