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

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21.9 inches

and

38.465 inches

46 inches

and

72 inches

72 inches

and

46 inches

43 inches

and

92 inches

answer is A.

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Detailed Solution

Given,
Diameter of circle

= 9 inches

We know,

Radius = \frac{Diameter}{2}

R = \frac{9}{2} in = 3.5 in

Take

π = 3.14

Now,
Area of circle

= π r^{2}

= 3.14 \times {(3.5)}^{2}

= 3.14 \times 12.25

= 38.465 i n^{2}

Circumference of circle

= 2 πr

= 2 \times 3.14 \times 3.5

= 21.98 inches

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