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Q.

How do you find the circumference and area of circle with diameter of 9 inches?

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a

21.9 inches and 38.465 inches

b

46 inches and 72 inches

c

72 inches and 46 inches

d

43 inches and 92 inches 

answer is A.

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Detailed Solution

Given,
Diameter of circle =9 inches
We know,
Radius=Diameter2
R=92 in=3.5 in
Take π=3.14
Now,
Area of circle =πr2
                      =3.14×3.52
                      =3.14×12.25
                      =38.465 in2
Circumference of circle =2πr
                                      =2×3.14×3.5
                                      =21.98 inches
 
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