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Q.

The ratio of the area and circumference of a circle with diameter d is:


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a

d

b

d 2  

c

d 4  

d

2d 

answer is C.

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Detailed Solution

We need to find the ratio of the area and circumference of a circle of diameter d.
Circumference of circle is,
C=πd  
Area of circle is,
A=π r 2 ⇒A=π d 2 2 ⇒A= π d 2 4  
The ratio of area to circumference of the circle is,
⇒R= π d 2 4 πd  
⇒R= d 4  
Therefore, the ratio is d:4   which is d4.
Hence, option 3 is correct.
 
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