A circle has an area of 49π in2. Which of the following is the circumference of the circle in terms of pi (π)?
14 π in
28 π in
7 π in
3.5 π in
Correct Answer : A
The initial step is to establish the relationship between area of a circle and the radius. The area of the circle is given by the formula

Now, substituting the 49 π
in2 in place of A in the equation above becomes:

We want to find r, therefore, we rearrange the equation as

Divide both sides by 


Take square root both sides of the equation


The radius of the circle is 7 in, and the circumference of the circle is determined as follows

Substituting the value of r=7 becomes

Thus, the circumference of a circle whose area is 49
in2 is 14
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Explanation
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Explanation
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Explanation
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Explanation
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Explanation
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Explanation
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Explanation
The initial step is to establish the relationship between area of a circle and the radius. The area of the circle is given by the formula

Now, substituting the 49 π
in2 in place of A in the equation above becomes:

We want to find r, therefore, we rearrange the equation as

Divide both sides by 


Take square root both sides of the equation


The radius of the circle is 7 in, and the circumference of the circle is determined as follows

Substituting the value of r=7 becomes

Thus, the circumference of a circle whose area is 49
in2 is 14
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